We can conclude that the marketing manager's claim is true.
To determine whether the marketing manager's claim is true, we need to conduct a hypothesis test.
Let p be the proportion of all children aged 8-12 who have cell phones. The marketing manager claims that p > 0.5, while the national consumers group survey found that 39/54 or p' = 0.722 have cell phones.
The null hypothesis is that the true proportion of children with cell phones is less than or equal to 0.5:
H0: p ≤ 0.5
The alternative hypothesis is that the true proportion of children with cell phones is greater than 0.5:
Ha: p > 0.5
We will conduct a one-tailed hypothesis test with a level of significance of 0.05.
Under the null hypothesis, the sample proportion follows a binomial distribution with parameters n = 54 and p = 0.5. The standard error of the sample proportion is given by:
SE = √[p(1-p)/n] = √[0.5(1-0.5)/54] = 0.070
The test statistic is calculated as:
z = (p' - p) / SE = (0.722 - 0.5) / 0.070 = 3.14
The critical value for a one-tailed test with a level of significance of 0.05 is 1.645, using the standard normal distribution table.
Since the test statistic (z = 3.14) is greater than the critical value (1.645), we reject the null hypothesis and conclude that there is sufficient evidence to support the claim that more than half of the children aged 8-12 have cell phones.
Therefore, we can conclude that the marketing manager's claim is supported by the data from the survey.
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A sphere has a diameter of 28 millimeters. Which measurement is closest to the volume of the sphere in cubic millimeters?
The volume of the sphere is 11494.04 cubic millimeters
The correct answer is an option (B)
We know that the formula for the volume of the sphere is :
V = 4/3 × π × r³
where r is the radius of the sphere
Here, A sphere has a diameter of 28 millimeters.
so, the radius of the sphere would be,
r = d/2
r = 28/2
r = 14 mm
Using above formula the volume of the sphere would be,
V = 4/3 × π × r³
V = 4/3 × π × 14³
V = 11494.04 cubic millimeter
Therefore, the correct answer is an option (B)
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please answer i will give brainlest
The probability of puling out
a Triangle is 1/8,a Circle is 1/2, a Square is 3/8.How to find the probabilityIn order to calculate the probability of extracting each shape from the bag, a formula can be employed:
Probability = Number of times the shape was taken out / Total number of times shapes were taken out
Given below are the frequency of each shape:
Triangle: 3 times
Circle: 12 times
Square: 9 times
Total number of times shapes were taken out = 3 + 12 + 9 = 24
Probability of taking out a Triangle
= 3 / 24
= 1/8
Probability of taking out a Circle
= 12/24
= 1/2
Probability of taking out a Square
= 9/24
= 3/8
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For the month of February, Mr. Johnson budgeted $350 for groceries. He actually spent $427. 53 on groceries. What is the approximate percent error in Mr. Johnson’s budget?
Please could you explain this??? with an answer I really need it
The approximate percentage error is 22.1514%.
Formulate: (427.53−350)÷350
Calculate the sum or difference: 77.53/350
Multiply both the numerator and denominator with the same integer:
7753/35000
Rewrite a fraction as a decimal: 0.221514
Multiply a number to both the numerator and the denominator:
0.221514×100/100
Write as a single fraction: 0.221514×100/100
Calculate the product or quotient: 22.1514/100
Rewrite a fraction with denominator equals 100 to a percentage:
22.1514%
Percent error is the difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage. In other words, the percent error is the relative error multiplied by 100.
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find 2 positive number with product 242 and such that the sum of one number and twice the second number is as small as possible.
The two positive numbers with a product of 242 and the smallest possible sum of one number and twice the second number are 11 and 22.
To find two positive numbers with a product of 242, we can start by finding the prime factorization of 242, which is 2 x 11 x 11. From this, we know that the two numbers we're looking for must be a combination of these factors.
To minimize the sum of one number and twice the second number, we need to choose the two factors that are closest in value. In this case, that would be 11 and 22 (twice 11). So the two positive numbers we're looking for are 11 and 22.
To check that these numbers have a product of 242, we can multiply them together: 11 x 22 = 242.
Now we need to check that the sum of 11 and twice 22 is smaller than the sum of any other combination of factors. The sum of 11 and twice 22 is 55. If we try any other combination of factors, the sum will be larger. For example, if we chose 2 and 121 (11 x 11), the sum would be 244.
Therefore, the two positive numbers with a product of 242 and the smallest possible sum of one number and twice the second number are 11 and 22.
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the lady tasting tea. this is one of the most famous experiments in the founding history of statistics. in his 1935 book the design of experiments (1935), sir ronald a. fisher writes, a lady declares that by tasting a cup of tea made with milk she can discriminate whether the milk or the tea infusion was first added to the cup. we will consider the problem of designing an experiment by means of which this assertion can be tested . . . our experiment consists in mixing eight cups of tea, four in one way and four in the other, and presenting them to the subject for judgment in a random order. . . . her task is to divide the 8 cups into two sets of 4, agreeing, if possible, with the treatments received. consider such an experiment. four cups are poured milk first and four cups are poured tea first and presented to a friend for tasting. let x be the number of milk-first cups that your friend correctly identifies as milk-first. (a) identify the distribution of x. (b) find p(x
P(X = k) = (1 - p)^4 for k = 0
P(X = k) = 4p(1 - p)^3 for k = 1
P(X = k) = 6p^2(1 - p)^2 for k = 2
P(X = k) = 4p^3(1 - p) for k = 3
P(X = k) = p^4 for k = 4
Note that these probabilities add up to 1, as they should for any probability distribution.
(a) The distribution of X can be modeled as a binomial distribution with parameters n = 4 and p, where p is the probability that the friend correctly identifies a milk-first cup as milk-first. Each cup that the friend tastes can either be identified correctly (success) or incorrectly (failure), and there are 4 cups that were poured milk-first in the experiment.
(b) To find the probability mass function (PMF) of X, we need to find the probability of each possible value of X. Since X is a binomial random variable, the PMF of X is given by:
P(X = k) = (n choose k) * p^k * (1 - p)^(n - k)
where (n choose k) is the binomial coefficient, given by:
(n choose k) = n! / (k! * (n - k)!)
where n! denotes the factorial of n.
In this case, n = 4 and there are 4 cups that were poured milk-first, so we have:
P(X = 0) = (4 choose 0) * p^0 * (1 - p)^4 = (1 - p)^4
P(X = 1) = (4 choose 1) * p^1 * (1 - p)^3 = 4p(1 - p)^3
P(X = 2) = (4 choose 2) * p^2 * (1 - p)^2 = 6p^2(1 - p)^2
P(X = 3) = (4 choose 3) * p^3 * (1 - p)^1 = 4p^3(1 - p)
P(X = 4) = (4 choose 4) * p^4 * (1 - p)^0 = p^4
Since X can only take on values between 0 and 4, the PMF of X is given by:
P(X = k) = (1 - p)^4 for k = 0
P(X = k) = 4p(1 - p)^3 for k = 1
P(X = k) = 6p^2(1 - p)^2 for k = 2
P(X = k) = 4p^3(1 - p) for k = 3
P(X = k) = p^4 for k = 4
Note that these probabilities add up to 1, as they should for any probability distribution.
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What is the probability that either event will occur?
A
B
9
9
P(A or B) = P(A) + P(B) - P(A and B)
P(A or B) = [ ?]
Enter as a decimal rounded to the nearest hundredth.
The probability that either event will occur is given as follows:
P(A or B) = 0.75.
How to calculate the probability?The formula used to calculate the probability is given as follows:
P(A or B) = P(A) + P(B) - P(A and B).
The total number of events from the Venn's diagram is given as follows:
4 x 9 = 36.
Hence the probability of each outcome is given as follows:
P(A) = (9 + 9)/36 = 0.5.P(B) = (9 + 9)/36 = 0.5.P(A and B) = 9/36 = 0.25.Hence the or probability is given as follows:
P(A or B) = P(A) + P(B) - P(A and B).
P(A or B) = 0.5 + 0.5 - 0.25
P(A or B) = 0.75.
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In the normed vector space R² with the usual norm, find a number r >0 such that Br(0,1) ∩ Bt(2,1)≠0
In the normed vector space R² with the usual norm, find a number r >0 such that B2(1,1)∩Br(3,3)≠0
|| (3,3) - (1,1) || < 2 + r
Simplifying this inequality, we get:
2√2 < 2 + r
r > 2√2 - 2
So, any value of r such that r > 2√2 - 2 will satisfy the condition B2(1,1)∩Br(3,3)≠0.
For the first question, we need to find an r such that the open ball centered at (0,0) with radius 1 (denoted as Br(0,1)) intersects with the open ball centered at (2,0) with radius t (denoted as Bt(2,1)). Since the usual norm is the Euclidean norm, the distance between (0,0) and (2,0) is 2. Thus, we have the inequality:
|| (2,0) - (0,0) || < 1 + t
Simplifying this inequality, we get:
2 < 1 + t
t > 1
So, any value of r such that 1 < r < 3 will satisfy the condition Br(0,1) ∩ Bt(2,1)≠0.
For the second question, we need to find an r such that the open ball centered at (1,1) with radius 2 (denoted as B2(1,1)) intersects with the open ball centered at (3,3) with radius r (denoted as Br(3,3)). Using the Euclidean norm, we have:
|| (3,3) - (1,1) || < 2 + r
Simplifying this inequality, we get:
2√2 < 2 + r
r > 2√2 - 2
So, any value of r such that r > 2√2 - 2 will satisfy the condition B2(1,1)∩Br(3,3)≠0.
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Find an equation of the tangent plane to the given surface at the specified point.z=2(x-1)^2 + 6(y+3)^2 +4, (3,-2,18)
The equation of the tangent plane to the given surface at the specified point (3, -2, 18) is z - 18 = 8(x - 3) - 12(y + 2).
To find the equation of the tangent plane to the given surface at the specified point (3,-2,18), we first need to find the partial derivatives of z with respect to x and y:
∂z/∂x = 4(x-1)
∂z/∂y = 12(y+3)
Then, we can evaluate these partial derivatives at the given point (3,-2,18):
∂z/∂x = 4(3-1) = 8
∂z/∂y = 12(-2+3) = -12
Next, we can use these partial derivatives and the point (3,-2,18) to write the equation of the tangent plane in point-normal form:
z - z0 = ∂z/∂x(x - x0) + ∂z/∂y(y - y0)
Plugging in the values we found:
z - 18 = 8(x - 3) - 12(y + 2)
Simplifying:
8x - 12y - z = -22
Therefore, the equation of the tangent plane to the given surface at the point (3,-2,18) is 8x - 12y - z = -22.
To find an equation of the tangent plane to the given surface z = 2(x - 1)^2 + 6(y + 3)^2 + 4 at the specified point (3, -2, 18), follow these steps:
1. Calculate the partial derivatives of the function with respect to x and y:
∂z/∂x = 4(x - 1)
∂z/∂y = 12(y + 3)
2. Evaluate the partial derivatives at the specified point (3, -2, 18):
∂z/∂x(3, -2) = 4(3 - 1) = 8
∂z/∂y(3, -2) = 12(-2 + 3) = -12
3. Use the tangent plane equation to find the tangent plane at the specified point:
z - z0 = ∂z/∂x(x - x0) + ∂z/∂y(y - y0)
where (x0, y0, z0) = (3, -2, 18)
4. Plug in the values and simplify the equation:
z - 18 = 8(x - 3) - 12(y + 2)
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The dog shelter has Labradors, Terriers, and Golden Retrievers available for adoption. If P(terriers) = 15%, interpret the likelihood of randomly selecting a terrier from the shelter.
Likely
Unlikely
Equally likely and unlikely
This value is not possible to represent probability of a chance event
The likelihood of randomly selecting a terrier from the shelter would be unlikely. That is option B
How to calculate the probability of the selected event?The formula that can be used to determine the probability of a selected event is given as follows;
Probability = possible event/sample space.
The possible sample space for terriers = 15%
Therefore the remaining sample space goes for Labradors and Golden Retrievers which is = 75%
Therefore, the probability of selecting the terriers at random is unlikely when compared with other dogs.
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Use technology or a z-score table to answer the question.
The expression P(z < 2.04) represents the area under the standard normal curve below the given value of z. What is the value of P(z < 2.04)
Step-by-step explanation:
Using z-score table the value is .9793 (97.93 %)
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A student is studying the wave different elements are similar to one w
Atem
NUMPA
199
Atem a
dices
Atom 2
NQ
Alam 4
Which two atoms are of elements in the same group in the periodic table?
The two atoms are of elements in the same group in the periodic table include the following: D. Atom 1 and Atom 2.
What is a periodic table?In Chemistry, a periodic table can be defined as an organized tabular array of all the chemical elements that are typically arranged in order of increasing atomic number (number of protons), in rows.
What are valence electrons?In Chemistry, valence electrons can be defined as the number of electrons that are present in the outermost shell of an atom of a specific chemical element.
In this context, we can reasonably infer and logically deduce that both Atom 1 and Atom 2 represent chemical elements that are in the same group in the periodic table because they have the same valence electrons of six (6).
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Complete Question:
A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below.
Which two atoms are of elements in the same group in the periodic table?
SOMEONE HELPPPPPPPPPLLP
Answer: 2
Step-by-step explanation:
give inequalities that describe the flat surface of a washer that is 3.6 inches in diameter and has an inner hole with a diameter of 3/7 inch.
The coordinates of any point on the flat surface of the washer, and the radius is half of the diameter, which is 3/7 inches.
To describe the flat surface of a washer that is 3.6 inches in diameter and has an inner hole with a diameter of 3/7 inch, we can use the following inequalities:
For the outer circumference of the washer:
[tex]x^2 + y^2[/tex]≤ [tex](3.6/2)^2[/tex]
where x and y are the coordinates of any point on the flat surface of the washer, and the radius is half of the diameter, which is 3.6/2 inches.
For the inner circumference of the washer:
[tex]x^2 + y^2[/tex] ≥ [tex](3/14)^2[/tex]
where x and y are the coordinates of any point on the flat surface of the washer, and the radius is half of the diameter, which is 3/7 inches.
Note that these inequalities represent the circular boundaries of the flat surface of the washer, where the outer circumference is a circle with radius 1.8 inches and the inner circumference is a circle with radius 3/14 inches. The flat surface of the washer is the region bounded by these two circles.
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an online used car company sells second-hand cars. for 30 randomly selected transactions, the mean price is 2900 dollars. part a) assuming a population standard deviation transaction prices of 290 dollars, obtain a 99% confidence interval for the mean price of all transactions. please carry at least three decimal places in intermediate steps. give your final answer to the nearest two decimal places.
We can say with 99% confidence that the true mean price of all transactions is between $2,799.16 and $3,000.84.
To obtain a 99% confidence interval for the mean price of all transactions, we can use the formula:
CI = ± z*(σ/√n)
Where:
= sample mean price = 2900 dollars
σ = population standard deviation = 290 dollars
n = sample size = 30
z = z-score for a 99% confidence level = 2.576 (from the standard normal distribution table)
Substituting these values into the formula, we get:
CI = 2900 ± 2.576*(290/√30)
CI = 2900 ± 100.84
CI = (2799.16, 3000.84)
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Two widgets and five gadgets cost $57. One widget and three gadgets cost $32.70 How much does one gadget cost?
Answer:
$8.40
Step-by-step explanation:
2w + 5g = 57
w + 3g = 32.7
w = 32.7 - 3g
2(32.7 - 3g) + 5g = 57
65.4 - 6g + 5g = 57
8.4 = g
Answer: $8.40
Two concentric circles form a target. The radii of the two circles measure 8 cm and 4 cm. The inner circle is the bullseye of the target. A point on the target is randomly selected.
What is the probability that the randomly selected point is in the bullseye?
Enter your answer as a simplified fraction in the boxes.
Answer:
1/4
Step-by-step explanation:
it came to me in a dream.
1/4 or 25% is the probability that the randomly selected point is in the bullseye.
What is probability?Probability is a number that expresses the likelihood or chance that a specific event will take place. Both proportions ranging from 0 to 1 and percentages ranging from 0% to 100% can be used to describe probabilities.
The area of the bullseye is the area of the inner circle with a radius of 4 cm. Similarly, the area of the entire target is the area of the outer circle with a radius of 8 cm.
The area of a circle is given by the formula A = πr², where A is the area and r is the radius.
Therefore, the area of the bullseye is:
A_bullseye = π(4 cm)² = 16π cm²
And the area of the entire target is:
A_target = π(8 cm)² = 64π cm²
So, the probability that the randomly selected point is in the bullseye is the ratio of the area of the bullseye to the area of the target:
P(bullseye) = A_bullseye / A_target
P(bullseye) = (16π cm²) / (64π cm²)
P(bullseye) = 1/4
Therefore, the probability that the randomly selected point is in the bullseye is 1/4 or 25%.
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Multiply: 7/11 x 1 1/6
Answer:
1(1/2)
Step-by-step explanation:
how you use this is do 7 divided by 11 and 11 divided by 6 which is 1 and 1/2
Answer:
77/66 (simplified would equal 7/6)
Step-by-step explanation:
When multiplying fractions you simply just multiply the numerators together, making the new numerator, then multiply the denominators together, making the new denominator, and you have your answer.
EXTRA: To simplify the fraction to its simplest you find a number that both the numerator and the denominator can be divided into equally, in this case it would be 11, then divide the numerator and denominator by this number and that would be your answer. Example; 77/66, divide 77 and 66 by 11 and you get 7/6.
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Workers at a warehouse of consumer goods gather items from the warehouse to fill customer orders
If the order contains 22 products, it will take 16.06 minutes to gather the items. The correct option is (b).
Based on the given regression output, the equation to predict the time it takes to gather items from the number of items in an order is:
Predicted time [tex]= 3.0979 + 2.7633[/tex] × (square root of items)
To find the predicted time for an order with 22 items, we can substitute the value of 22 into the equation:
Predicted time [tex]= 3.0979 + 2.7633[/tex] × (square root of 22)
Predicted time ≈ [tex]16.06[/tex]
The predicted time is estimated using a least-squares regression analysis that relates the number of items in an order to the time taken to gather them. The regression output provides the equation to predict the time. By substituting the value of 22 items into the equation, the predicted time is calculated to be approximately 16.06 minutes.
Therefore, the predicted time, in minutes, that it took to gather the items for an order with 22 items is approximately 16.06 minutes.
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Complete Question:
Workers at a warehouse of consumer goods gather items from the warehouse to fill customer orders. The number of Items in a sample of orders and the time, in minutes, it took the workers to gather the items were recorded. A scatterplot of the recorded data showed a curved pattern, and the square root of the number of items was taken to create a linear pattern. The following table shows computer output from the least-squares regression analysis created to predict the time it takes to gather items from the number of items in an order.
Predictor Coef
Constant 3.0979
Square root of items 2.7633
R-Sq=96.7%
Based on the regression output, which of the following is the predicted time, in minutes, that it took to gather the items if the order has 22 Items?
a. 7.99
b. 16.06
c. 27.49
d. 17.29
e. 63.89
What’s the answer I need help asap?
The coordinate point (8, -15) is lies in fourth quadrant.
The given coordinate point is (8, -15).
Part A: Here, x-coordinate is positive that is 8 and the y-coordinate is negative that is -15.
Quadrant IV: The bottom right quadrant is the fourth quadrant, denoted as Quadrant IV. In this quadrant, the x-axis has positive numbers and the y-axis has negative numbers.
So, the point lies in IV quadrant.
Part B:
Here r²=x²+y²
r²=8²+(-15)²
r²=64+225
r²=289
r=√289
r=17 units
So, the radius is 17 units
Therefore, the coordinate point (8, -15) is lies in fourth quadrant.
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find the minimum sample size when we want to construct a 95% confidence interval on the population proportion for the support of candidate a in the following mayoral election. candidate a is facing two opposing candidates. in a preselected poll of 100 residents, 22 supported candidate b and 14 supported candidate c. the desired margin of error is 0.06.
The minimum sample size needed to construct a 95% confidence interval with a margin of error of 0.06 for the population proportion supporting candidate A is 268 residents.
To find the minimum sample size for a 95% confidence interval on the population proportion supporting candidate A, we'll need to use the following terms: sample size (n), population proportion (p), margin of error (E), and confidence level (z-score).
First, let's determine the proportion supporting candidate A from the preselected poll:
100 residents - 22 (supporting B) - 14 (supporting C) = 64 (supporting A)
So, the proportion p = 64/100 = 0.64.
For a 95% confidence interval, the z-score is 1.96 (found using a standard normal distribution table or calculator).
Now, we can use the formula for sample size calculation:
n = (z² × p × (1-p)) / E²
Substituting the values:
n = (1.96² × 0.64 × 0.36) / 0.06²
n ≈ 267.24
Since sample size must be a whole number, we round up to the nearest whole number, which is 268.
Therefore, the minimum sample size needed to construct a 95% confidence interval with a margin of error of 0.06 for the population proportion supporting candidate A is 268 residents.
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Consider the following statistical argument:
"Emily is a member of a study group for her philosophy class composed of 16 students including herself. There are about 30 students total in her class. After talking with the study group on Monday night, she found that each study group member received a high grade on the most recent quiz. So, Emily concluded that everyone in the class must have received a high grade on the quiz."
What fallacy, if any, is being committed? Select all that apply.
A. Biased Sample Fallacy
B. Hasty Generalization Fallacy
C. Biased Questions
D. No Fallacy
In the statistical argument provided, Emily concludes that everyone in the class must have received a high grade on the quiz based on the information from her study group. The fallacy being committed in this argument is a combination of A. Biased Sample Fallacy and B. Hasty Generalization Fallacy.
A. Biased Sample Fallacy occurs when the sample is used to make a conclusion that is not representative of the entire population. In this case, Emily's study group consists of 16 students out of a total of 30 students in her class. The study group may not be representative of the whole class, as it is a smaller sample and could be composed of more diligent or prepared students.
B. Hasty Generalization Fallacy is when a conclusion is made based on insufficient evidence. In this argument, Emily concludes that everyone in the class must have received a high grade based on the performance of her study group alone. This is a hasty generalization as she has not considered the performance of the other students in the class.
To sum up, the argument commits both A. Biased Sample Fallacy and B. Hasty Generalization Fallacy, as it bases its conclusion on a potentially unrepresentative sample and insufficient evidence.
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Please help me with this asap
Answer:
m = - 3 , b = 5
Step-by-step explanation:
calculate the slope m using the slope formula
m = [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]
with (x₁, y₁ ) = (0, 5) and (x₂, y₂ ) = (2, - 1) ← 2 points on the line
m = [tex]\frac{-1-5}{2-0}[/tex] = [tex]\frac{-6}{2}[/tex] = - 3
the y- intercept b is the value of y on the y- axis where the line crosses
that is b = 5
Answer:
b = 5
m = -3
Step-by-step explanation:
y-intercept is where the line intersects the y-axis. So, the line intersects at (0,5).
So, y-intercept = b = 5
Choose two points on the line: (0,5) and (1,2)
x₁ = 0 ; y₁ = 5
x₂ = 1 ; y₂ = 2
Substitute the points in the below formula to find the slope.
[tex]\sf \boxed{\bf Slope =\dfrac{y_2-y_1}{x_2-x_1}}[/tex]
[tex]= \dfrac{2-5}{1-0}\\\\=\dfrac{-3}{1}[/tex]
[tex]\boxed{\bf m = -3}[/tex]
Find the volume of each rectangular prism from the given parameters.
length = 19 in ; width = 17 in ; height = 13 in
best answer gets 55 points
You are getting ready to retire and are currently making $79,000/year. According to financial experts quoted In the lesson, what is the minimum that you should have saved in retirement accounts if this is your salary? Show all your work
According to Financial experts you should save between 10% to 15% of your annual income for retirement. For a salary of $79,000/year, the minimum saved should be between $790,000 to $948,000.
Financial experts generally recommend that you should aim to save between 10% to 15% of your income each year for retirement. For a salary of $79,000 per year, this means saving between $7,900 to $11,850 annually.
Assuming you have been saving for retirement throughout your working years and are ready to retire, financial experts suggest that you should have saved at least 10 to 12 times your current annual income to maintain your pre-retirement standard of living. Therefore, the minimum you should have saved in retirement accounts is
$79,000 x 10 = $790,000 (using the conservative end of the range)
or
$79,000 x 12 = $948,000 (using the more aggressive end of the range)
Therefore, the minimum you should have saved in retirement accounts if you are currently making $79,000/year is between $790,000 to $948,000, depending on the end of the range you choose to follow.
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A manufacturer inspects 800 personal video players and finds that 796 of them have no defects. What is the experimental probability that a video player chosen at random has no defects? Express your answer as a percentage.
Answer:
99.6%
Step-by-step explanation:
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tysm!
If AD= 4, find CD and CB
Step by step pls
The value of the sides are;
CB = 13.8
CD = 6. 9
How to determine the valuesTo determine the value of the sides of the triangle, we need to know the different trigonometric identities are;
sinetangentcosinecotangentcosecantsecantFrom the information given, we have that;
Using the sine identity, we have that;
tan 60 = CD/4
cross multiply the values, we have;
CD = 4(1.73)
multiply the values
CD = 6.9
To determine the value;
sin 30 = 6.9/CB
CB = 13.8
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Consider the polynomial function f(x) - x4 -3x3 + 3x2 whose domain is(-[infinity], [infinity]). (a) Find the intervals on which f is increasing. (Enter you answer as a comma-separated list of intervals. ) Find the intervals on which f is decreasing. (Enter you answer as a comma-separated list of intervals. ) (b) Find the open intervals on which f is concave up. (Enter you answer as a comma-separated list of intervals. ) Find the open intervals on which f is concave down. (Enter you answer as a comma-separated list of intervals. ) (c) Find the local extreme values of f. (If an answer does not exist, enter DNE. ) local minimum value local maximum value Find the global extreme values of f onthe closed-bounded interval [-1,2] global minimum value global maximum value (e) Find the points of inflection of f. Smaller x-value (x, f(x)) = larger x-value (x,f(x)) =
The answers are:
(a) f is decreasing on (-∞, 0) and increasing on (0, ∞).
(b) f is concave up on (-∞, ∞).
(c) Local minimum value at x = 0, local maximum value DNE.
(d) Global minimum value is -2 at x = -1, global maximum value is 22 at x = 2.
(e) There are no points of inflection.
(a) To find where the function is increasing or decreasing, we need to find the critical points and test the intervals between them:
[tex]f(x) = x^4 + 3x^3 + 3x^2\\f'(x) = 4x^3 + 9x^2 + 6x[/tex]
Setting f'(x) = 0, we get:
[tex]0 = 2x(2x^2 + 3x + 3)[/tex]
The quadratic factor has no real roots, so the only critical point is x = 0.
We can test the intervals (-∞, 0) and (0, ∞) to find where f is increasing or decreasing:
For x < 0, f'(x) is negative, so f is decreasing.
For x > 0, f'(x) is positive, so f is increasing.
Therefore, f is decreasing on (-∞, 0) and increasing on (0, ∞).
(b) To find where the function is concave up or concave down, we need to find the inflection points:
f''(x) =[tex]12x^2 + 18x + 6[/tex]
Setting f''(x) = 0, we get:
0 = [tex]6(x^2 + 3x + 1)[/tex]
The quadratic factor has no real roots, so there are no inflection points.
Since the second derivative is always positive, f is concave up everywhere.
(c) To find the local extreme values, we need to find the critical points and determine their nature:
f'(x) = [tex]4x^3 + 9x^2 + 6x[/tex]
At x = 0, f'(0) = 0 and f''(0) = 6, so this is a local minimum.
There are no local maximum values.
(d) To find the global extreme values on [-1, 2], we need to check the endpoints and the critical points:
f(-1) = -2, f(0) = 0, f(2) = 22
The global minimum value is -2 at x = -1, and the global maximum value is 22 at x = 2.
(e) To find the points of inflection, we need to find where the concavity changes:
Since there are no inflection points, there are no points of inflection.
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Find the area of the shaded region.
The area of the shaded region is 9198.11 in³ - 112.5 in².
We have,
Sphere:
Diameter = 26 in
Radius = 26/2 = 13 in
Volume.
= 4/3 πr³
= 4/3 x 3.14 x 13 x 13 x 13
= 9198.11 in³
Now,
The unshaded region is a trapezium.
Height = 5 in
Parallel sides = 19 in and 26 in
Area = 1/2 x height x (sum of the parallel sides)
= 1/2 x 5 x (19 + 26)
= 1/2 x 5 x 45
= 1/2 x 225
= 112.5 in²
Now,
The area of the shaded region.
= Volume of the sphere - Area of the trapezium
= 9198.11 in³ - 112.5 in²
Thus,
The area of the shaded region is 9198.11 in³ - 112.5 in².
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7. a) List three pairs of fractions that have a sum of 3\5.
The three pairs of fraction whose sum is 3/5 are
1/5 + 2/5-2/5+1-6/5+9/5We have to find pairs of fractions that have a sum of 3/5.
First pair:
1/5 + 2/5
= 3/5
Second pair:
= -2/5 + 1
= -2/5+ 5/5
= 3/5
Third pair:
= -6/5 + 9/5
= 3/5
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A cooler is filled with 4 1/2 gallons of water. There are small cups that each hold 1/32 gallon.
How many small cups can be filled with the water from the cooler before it's empty?
Answer: its 144 i think
Step-by-step explanation: Math