Answer:
9 hours and 20 minutes: b
Step-by-step explanation:
4*60=240
7x240=1680
1680/3=560
560= 9 h 20 m
The time required when 3 electricians are working is 9 hours and 20 minutes.
What is an expression?An expression contains one or more terms with addition, subtraction, multiplication, and division.
We always combine the like terms in an expression when we simplify.
We also keep all the like terms on one side of the expression if we are dealing with two sides of an expression.
Example:
1 + 3x + 4y = 7 is an expression.com
3 + 4 is an expression.
2 x 4 + 6 x 7 – 9 is an expression.
33 + 77 – 88 is an expression.
We have,
The time required to complete the job varies inversely with the number of people working.
This means that if the number of people working decreases, the time required to complete the job will increase.
We can use the formula for inverse variation to solve the problem:
t = k/n
where t is the time required to complete the job, n is the number of people working, and k is a constant of proportionality.
We can find k by plugging in the given values:
4 = k/7
k = 28
Now we can use the formula to find the time required when 3 electricians are working:
t = 28/3
t ≈ 9.33 hours
Converting this to hours and minutes, we get:
t ≈ 9 hours and 20 minutes
Thus,
The time required when 3 electricians are working is 9 hours and 20 minutes.
Learn more about expressions here:
https://brainly.com/question/3118662
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a taxicab company charges $2.10 and $0.80 a mile. Sheila took a cab and paid a fare of $11.70.Which equation represents this situation with the correct number of miles?
Answer:
D 2.10+0.80m=11.70, 12 miles
Step-by-step explanation:
11.70-2.10=9.6
9.6/0.80=12
so there is 12 miles and only d has 12 miles
hope this helps have a blessed day
A plant is already 54 centimeters tall, and it will grow one centimeter every month. The plant's height, H (in centimeters), after M months is given by the following.
What is the plant's height after 13 months?
Answer:
67 cm
Step-by-step explanation:
We are given the initial height of the plant let's call it H.
H = 54 cm. This is the original height of the plant at M(months) = 0.
We are given that it grows at 1 cm/month. This is the rate of growth.
Rate = 1
Time (M) is given in Months.
So when M = 0, H = 54
Let's say M = 1, That is one month has passed. In this time the plant's height would have increased by 1 cm. So our plant's height would be H = 54+1 = 55 cm.
When Two months have passed our plant's height would be H = 54 + 2 = 56 cm , since every month our plant gains 1 cm in Height, we can make a fuction for this.
H = 1M + 54.
Now we just plug in 13 for M, to get 13 months.
H = 13 + 54
H = 67 cm
So our plant would be 67 cm in height after 13 months.
Tell weather each pair is parallel, perpendicular, or neither: 3х + 2y = 5
Зу + 2x = -3
Elena is feeding her neighbor’s dogs. Each dog gets 1/2 cup of dog food, and she uses 3 cups of food when she feeds them. How many dogs does her neighbor have?
Answer:
brainliest please
Step-by-step explanation:
6 dogs because 1/2 cup per dog 6 divided by 3 = 1/2 or 2
so2 dogs per cup
HEEEEELLLLLLPPPPPPP
>:D
Answer: Mulan= Shan yu
Kuzko= Yzma
Hercules= hades
Step-by-step explanation:
Somebody help me please....Make it right..
Answer : 4/15
Step-by-step explanation:
Answer:
2/5
Step-by-step explanation:
2/15, 1/5, 4/15, 1/3
Get a common denominator
2/15, 3/15, 4/15, 5/15
We are adding 1/15 each time
The next term would be 6/15 which simplifies to 2/5
in Mike’s house are broken now. His father replaced 3/14 of the broken) .4 windows. Uncle Jack replaced 1/7 of the broken windows. Who replaced the greater fraction of the broken windows?
Answer:
Mike's father produces a greater fraction.
Step-by-step explanation:
Amount of windows replaced by Mike's father = 3/14
Amount of windows replaced by Uncle Jack = 1/7
This 1/7 can also be expressed as 2/14
Now, since they both have the same denominators, it means that the higher the numerator the greater than the other fraction.
Thus, 3/14 is greater than 2/14.
Hence, Mike's father replaced a greater fraction of the broken windows.
WASTING ALL MY POINTS FOR THIS TO BE ANSWERED!
CORRECT answers will get BRAINLY points.
BRAINLIEST will get awarded.
Answer:
I cannot see the question because of my chromebook. ima quess eleventeen
Step-by-step explanation:
PLZ HELP!!
write an equation in pointslope form for the line through the given point through the given line (8, -3);m= -1/4
Answer:
y + 3 = - [tex]\frac{1}{4}[/tex](x - 8)
Step-by-step explanation:
The equation of a line in point- slope form is
y - b = m(x - a)
where m is the slope and (a, b) a point on the line
Here m = - [tex]\frac{1}{4}[/tex] and (a, b ) = (8, - 3 ), then
y - (- 3) = - [tex]\frac{1}{4}[/tex](x - 8) , that is
y + 3 = - [tex]\frac{1}{4}[/tex](x - 8)
what is -4m^3/10n ÷ 2m^2/5n
Answer:
-m[tex]n^{2}[/tex]
Step-by-step explanation:
Convert a salary of 36000 per year to earnings per week. Please help preferably fast since I'm doing a test
Which one is it? I got confused plz help
Answer:
Red: 2.035 x 10(4)
Step-by-step explanation:
Answer:
Red.
Step-by-step explanation:
Scientific notation consists of the ones place with a decimal right after it and a 10 to the something power next to it, therefore red is your answer.
what is 1-1 i wanna know because i dont know
Answer:
Step-by-step explanation: 0
Answer:
0
Step-by-step explanation:
no explanation needed
What kind of sequence is this? –165, –180, –195, –210
Henry can fold 80 take-out pizza boxes every 40 minutes. How long will it take for him to fold 120 boxes?
Answer:
60 minutes to fold 120 boxes
Step-by-step explanation:
easy, simply divide 40 by 2 then multiply it by 3 because this will mean hes folded 120 boxes...
40 divided by 2 is 20 times 3 is 60
80 divided by 2 is 40 times 3 is 120.
Answer:
3200
Step-by-step explanation:
you will multiply 80 by 40
80×40=3200
the graph of y=(1/3)x-1
Answer:
Step-by-step explanation:
Solve 7(f-5) = 28
Help meeeee
Answer:
7(f-5)=28
f-5=28/7
f-5=4
f=9
help me plz i’ll give extra points
Answer:
B) mass and height
Answer:
B
Step-by-step explanation:
Gravitational potential energy depends on an object's weight and its height above the ground (GPE = weight x height).
During their field trip the students had the following lunch options. For their main meal they had four options: Sandwich, Burger, Pizza and Chicken Tenders. For drinks their options was limited to two options Water and Gatorade. And for their side order they had two options: chips or fries. What is the probability than the next person will choose to have Chips for their meal?
Answer:
50%
Step-by-step explanation:
beacuse their are only 2 options which means 50% for each option. so when the student goes to pick there is a 50% chance their pick either one.
Pls i have less time Evaluate the expression for k = –4.
–6 + 21k =
Answer:
is -90
Step-by-step explanation:
−6+(21)(−4)
=−6+−84
=−90
Please please help pleaseeeeee
also .. it wouldnt let me crop the photo ..
CAN YOU PLS HELP ME I BEG YOU I WILL GIVE YOU BRAINLET ND SIXTY POINTS pllls i beg you
math!!!
PLEASE HELP ITS TIMED!!!
Order from least to greatest -1/2, -3/4, -2/5
Answer:
-2/5, -1/2, -3/4
Step-by-step explanation:
You have to have the same denominator.
-10/20, -15/20, -8/20
Hope this helps!
help me plz i’m begging
Answer:
I believe the answer is the first one. definitely not the third or fourth. and it should only be exponented by t not 2t because then it'd be double what you should have.
How do you identify proportional relationships?
You asked "How do you identify proportional relationships?"
It would be by determining whether two quantities are in a proportional relationship.
A vendor sells hot dogs and bags of potato chips. A customer buys 3 hot dogs and 5 bags of potato chips for $9.50. Another customer buys 2 hot dogs and 5 bags of potato chips for $8.00. Find the cost of each item.
Step-by-step explanation:
3d + 5p=9.50
2d + 5p=8
1 hot dog cost $1.50
2 × 1.50 + 5p = 8
3 + 5p = 8
5p = 8 - 3
5p = 5
p = 1
1 bag of potato chips cost $1.00
HURRYYYYYYY
Fill in the blank with the correct number.
A number is divisible by
divisible by four.
if the last two digits form a number
A) 3
B) 4
C) 6
D) Both 3 and 4
Answer:
D
Step-by-step explanation:
the answer is D: Both 3 and 4
Which is the proportion for the ratio 3/6
15/18
3/12
9/18
Rewrite the function
g(x) = 4x2 – 28x + 49
Answer:
g(X)=4(x-7/2)^2+0
Step-by-step explanation:
khan said it was right
Mai solved the equation below incorrectly. Identify Mai's error and then solve the equation correctly.
X-9) = {(x + 18)
3x - 3= kx +9
1
4
X-3=9
1
41
-x = 12
X = 48
What was Mai's error?
Answer: Please see explanation column for answer.
x= -36
Step-by-step explanation:
Step 1
from the attachment, Mai's solving is given as
1/3 (1/2x- 9) = 1/2 (x+18)
1/6x-3= 1/2x+9
1/4x-3=9
1/4x=12
x=48
Mai's error started when he subtracted wrongly 1/2 x from 1/6x which gave him 1/4 x instead of - 1/3 x.
Solving correctly, we have that
1/3(1/2x-9) = 1/2(x+18)
1/6x -3= 1/2x+ 9
taking like terms to like terms
1/6x-1/2x= 9+3
(1-3)/6x= 12
-2/6x= 12
-1/3x= 12
multiplying both sides by -3
-1/3x X -3 = 12 X -3
x= -36