Answer:
Is that the question? I don't think it is
In each case below, we describe a study to determine whether exercise helps increase certain mood enhancing chemicals in the brain. Indicate whether each describes an experiment or an observational study.
a). Using a random sample of 100 people, we randomly assign half of them to participate in a regular exercise program for a six-week period while the other half makes no changes. At the end of the time period, we measure the brain chemicals.
b). We contact a random sample of 100 people and record how much each person exercises and also measure the chemicals in the brain for each person.
Answer:
A)Experimental Study
B)Observational Study
Step-by-step explanation:
Observational Study : A study where researchers simply collect data based on what is seen and heard and infer based on the data collected.
Experimental Study: A study which involve the random assignment of -participants into different groups in order to determine the causal effect of a certain condition on a certain outcome .
A) In this case we are randomly classifying the subjects into two groups, where one group participate in a regular exercise program for a six week period, while the other half makes no changes. In this Part we are not observing the data . we are doing experiment over here and comparing those two different groups.
So, By definition It is an experimental study
B) In this case we are recording the data of each person and decision will be based on data
So, By definition It is an observational study
20-21_P00117979_TFA_G10_MTH_E_GeometricProofsPrep ( Items
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Exit Testing
8.
Angle 1 and Angle 3 are vertical angles. The measure of Angle 1 is (3x +72)' and the measure of Angle 3 is (6x)". What is
the value of x?
A2
B
8
C. 12
D.24
Time Remaining: 00:38:15
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6
Answer: on angle 1 x=12 and on angle 3 x=24
Step-by-step explanation: i think
I need help please! The one from mr.squarepants pls it’s due today !!!
Answer:
He needs to work 8.25 hours more.
Step-by-step explanation:
2.25 + 3.50 (3 1/2) - 5.75
5.75 + 6 = 11.75
20 - 11.75 = 8.25
Answer:
8.25 more hours.
Step-by-step explanation:
2.25+3 1/2+6=11.75
Then:
20-11.75=8.25
18. Simplify the following expression: 35+ (-13) + (+8) -(-6).
O A.50
O B. 24
O C.44
O D.36
Answer:
36 D.
Step-by-step explanation:
+ - = -
+ + = +
- - = +
35 - 13 + 8 + 6
22 + 8 + 6
30 + 6
36
1. A pitched roof is built with a 1:3 ratio of rise to span. If the rise of the roof is 10 meters, what is the span
Answer:
The answer is B) the span of the roof is 4
Step-by-step explanation:
The span is 30 meters if the pitched roof is built with a 1:3 ratio of rise to span.
What is the ratio?It is described as the comparison of two quantities to determine how many times one obtains the other. The proportion can be expressed as a fraction or as a sign: between two integers.
We have:
A pitched roof is built with a 1:3 ratio of rise to span
rise/span = 1/3
rise = 10 meters
10/span = 1/3
span = 3×10 = 30 meters
Thus, the span is 30 meters if the pitched roof is built with a 1:3 ratio of rise to span.
Learn more about the ratio here:
brainly.com/question/13419413
#SPJ2
Find the unit rate. Round to the nearest hundredth, if necessary.
$1.99 for 12 lb
The unit rate is $
Answer:
Convert to a decimal by dividing the numerator by the denominator.
0.17
dollars per pound
Step-by-step explanation:
Convert to a decimal by dividing the numerator by the denominator.
0.16583 (keep adding 3 at the end)
0.17 dollars per pound
Which postulate or theorem proves that these two triangles are
congruent?
HL Congruence Theorem
SAS Congruence Postulate
ASA Congruence Postulate
AAS Congruence Theorem
Answer:
ASA
Step-by-step explanation:
Took the test.
Order the numbers from least to greatest:
square root of 81, square root of 72, 9.2, 8.6
Type the correct order of each item (eg. 1, 2, 3, etc):
8.6
9.2
square root of 81
square root of 72
Simplify all the given.
√81 = 9
√72 ≈ 8.5
9.2 = 9.2
8.6 = 8.6
From here, you can just sort it out.
From least to greatest:
1) √72
2) 8.6
3) √81
4) 9.2
Your goal is to save $50. So far, you have saved $34. How much more money do you need to save? Write your answer as a rational number.
Answer:
You need to save $16 more dollars.
Step-by-step explanation:
If you add 16 to 34 you get 50.
(x² + 4x – 22) + (x + 6)
Answer:
12
Step-by-step explanation:
It costs $3.45 to buy3/4 lb of chopped walnuts. How much would it cost to purchase 7.5 lbs of walnuts? Explain or show your reasoning. l
Answer:
$34.5
Step-by-step explanation:
because 3/4 of a pound is basically .75 of a pound. so the conversion from .75 of a pound to 7.5 pounds is just multiplying by 10. therefor you just multiply the initial price by 10
Answer:
$34.50
Step-by-step explanation:
please give me brainliest
find the missing
number
+ 16 = 28
Elevator 1 in a building moved from ground position to a final position of +16 feet. Elevator 2 in the same building moved from ground to a final position of –25 feet. Which statement best describes the final positions of these two elevators? (1 point) Elevator 1 is 16 feet below ground level, and elevator 2 is 25 feet above ground level. Elevator 1 is 16 feet above ground level, and elevator 2 is 25 feet below ground level. Elevator 1 is 16 feet above ground level, and Elevator 2 is 25 feet below the position of Elevator 1. Elevator 1 is 16 feet below ground level, and Elevator 2 is 25 feet above the position of Elevator 1.
Answer B
Step-by-step explanation:
Answer:
it is BStep-by-step explanation:
i already took the test please like it and give 5 stars Thank youIs it -56/65????????????????
Answer:
[tex] \cos (u + v) = -\dfrac{56}{65} [/tex]
Good job!
Step-by-step explanation:
[tex] \cos (u + v) = \cos u \cos v - \sin u \sin v [/tex]
[tex] \sin u = -\dfrac{3}{5} [/tex]; u is in QIII.
That makes [tex] \cos u = -\dfrac{4}{5} [/tex]
[tex] \sin v = -\dfrac{12}{13} [/tex]; v is in QIV.
That makes [tex] \cos v = \dfrac{5}{13} [/tex]
[tex] \cos (u + v) = (-\dfrac{4}{5})(\dfrac{5}{13}) - (-\dfrac{3}{5})(-\dfrac{12}{13}) [/tex]
[tex] \cos (u + v) = -\dfrac{20}{65} - \dfrac{36}{65} [/tex]
[tex] \cos (u + v) = -\dfrac{56}{65} [/tex]
You are correct.
Answer:
Step-by-step explanation:
-0.8615
Sarah traveled 145 miles in
2.5 hours. How fast was
Sarah driving?
Ma
Answer:
58 mph
Step-by-step explanation:
145/2.5=1450/25=58
The variable y is directly proportional to the variable x. If y = 32 when x = 20, what is the value of x when y = 40?
Answer
25
Step-by-step explanation:
20/32 = 0.625
40 x 0.625 = 25
You can check by doing 25/40 and see if you get the same proportion (x/y)
25 is the correct answer 32/20 is 1.6 and 40/25 is also 1.6
2) -9u-17 = -5u -7
Yallll help meeeI’ve been stuck
Answer:
u = -4.8 :)
Step-by-step explanation:
-9u-17=-5u-7
-5u=24
24/-5=-4.8
Question
Example
Step by Step
Jennifer is saving money to buy a bike. The bike costs
$213. She has $123 saved, and each week she adds $18
to her savings.
How long will it take her to save enough money to buy
the bike?
It will take her
weeks _____to save for the bike.
Answer:
5
Step-by-step explanation:
18x5=90+123=213.
Whats the mean of 62,78,59and 89
[tex]\huge {\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}[/tex]
As we know that ,
⠀⠀⠀⠀Mean= sum of all numbers/ total number of numbers[tex] \longrightarrow [/tex] Mean= 62+78+59+89/4
[tex] \implies [/tex] Mean = 288/4
[tex] \implies [/tex] Mean= 72[tex]\huge\boxed{\fcolorbox{purple}{yellow}{Answer\:= \:72}}[/tex]Answer:
72
Step-by-step explanation:
62 + 78 + 59 + 89 = 288
then count how many data you have
288 / 4 = 72
Ernie worked at his job on Saturday and Sunday last weekend, earning $14 per hour. His
sister, Perla, also worked on the weekend and earned a total of $126.
If Ernie and Perla earned the same amount of money at their jobs last weekend, how many
hours did Ernie work?
Answer:
9 hours
Step-by-step explanation:
126 divided by 14 = 9
You can check your answer by 9 times 14 which would give you 126.
Round off the following numbers to 2 significant figures.
156
Answer:
your answer would be 160
Which are removable discontinuities?
x = -2
x = -2 and x = 0
x = 0 and x = 4
x = -2, x = 0, and x = 4
Answer:
C
Step-by-step explanation:
Got it right on eng
Answer:C
Step-by-step explanation:
What is the inverse of the function f(x) = 1/4x – 12?
h(x) = 48x – 4
h(x) = 48x + 4
h(x) = 4x – 48
h(x) = 4x + 48
Answer:
h(x)=4x+48
Step-by-step explanation:
f(x) = 1/4x – 12
x=1/4y-12
x+12=1/4y
4x+48=y
h(x)=4x+48
Solve: -19x- 1 = -12x + 34
19−1=−12+34
19x-1=-12x+34
19x−1=−12x+34
19−1+1=−12+34+1
T is between S and U. ST= 10 and TU = 6. what is the length of SU.
2(x + 7) + 3x = 12 (given)
2x + 14 + 3x - 12 (?)
5x + 14 - 12 (simplify)
5x = -2 (subtraction)
x = -2/5(division)
What is the missing reason?
A)
Addition
B)
Subtraction
c)
Reflexive Property
D)
Distributive Property
Which decimal number is equal to 18?
0.125
0.125¯¯¯¯¯
0.125¯¯¯¯
0.125¯
Answer:
if you mean 1/8 then its 0.125 (top choice)
Step-by-step explanation:
1/8=(1/4)/2=0.25/2=0.125
Evaluate using the order of operations. Enter the answer in simplest form.
3/5+1/7÷3
Answer:
0.64761904761
Step-by-step explanation:
The basketball team scored a total
of 80 points, all off of 2-point
baskets and 3-point baskets (no
they didn't make any free throws). If
six 3-point baskets were made, find
the number of 2-point baskets
made.
Answer:
31 2-point baskets were made
Step-by-step explanation:
We can find how many of the 80 points were made with 2-point baskets by subtracting all the points gained through 3-point baskets. Since there are six 3-point baskets:
# of points through 2-point baskets = 80 - 6(3) = 80 - 18 = 62
To find the number of 2-point baskets that were made, divide the points by the worth of the basket:
# of 2-point baskets made = 62/2 = 31
9514 1404 393
Answer:
31
Step-by-step explanation:
6×3 = 18 of the 80 points were from 3-point baskets, so the remaining 62 points were 2-point baskets.
62 = 2b
62/2 = b = 31
31 2-point baskets were made.
Select two fractions equivalent to 21/28
[] 42/56
[] 3/4
[] 3/9
[] 3/7