1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vlad1618 [11]
2 years ago
12

Christopher can paint the interior of his house in 15 hours. if he hires cynthia to help him they can do the same job together i

n 9 hours. if he lets cynthia work alone, how long will it take her to paint the interior of his house
Mathematics
1 answer:
jenyasd209 [6]2 years ago
7 0

If Christopher can paint his whole house in 15 hours, then he can get 1/15 of the job done in a single hour. If he hires Cynthia to help and they get the job done together (the sum of their efforts) in 9 hours, they can get 1/9 of the job done in a single hour. We are looking for how long Cynthia would take to do it on her own. Remember we are adding their efforts together and setting that equal to the total, so the equation is \frac{1}{15}+\frac{1}{x}=\frac{1}{9}. What we are going to do here, what makes the most sense in solving for x, is to move the term with x in it to the other side of the equation and move the 1/9 over by subtraction. \frac{1}{15}-\frac{1}{9}=-\frac{1}{x}. Of course before we can subtract those 2 fractions we need a common denominator, which happens to be 45: \frac{3}{45}-\frac{5}{45}=-\frac{1}{x} and -\frac{2}{45}=-\frac{1}{x}. We will cross multiply to get 2x = 45 and divide to find that it takes Cynthia 22.5 hours to do the job if she had to do it alone.

You might be interested in
I NEEP HELP ON THIS NOWWWWWW
andrey2020 [161]

Answer:

vertex and AOS is 0, and i think the stretch is 1

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
3 000 000 000+200 000 000+600 000+20 000+9
Leona [35]
3200620009 is the answer to your question
3 0
3 years ago
Read 2 more answers
TIME SENSITIVE! PLEASE HELP!
Readme [11.4K]

Answer:

Answer choice A

Step-by-step explanation:

For the first letter, there are 26 options, as there are for the second and third letter. For each of the three numbers, there are 10 digits to choose from. Therefore, 26*26*26*10*10*10=17,576,000, or answer choice A. Hope this helps!

7 0
3 years ago
#25 need help ASAP!!!!!
miv72 [106K]

Answer:

You need to find the surface of each area and sum them up.

Step-by-step explanation:

You will need the surface area for each side.

So 2 up-bottom, 2 left-right and two front-back

2*(4*3) + 2*(2*4) + 2(3*2)

2*12 + 2*8 + 2*6

24 + 16 + 12

Total area = 52

4 0
3 years ago
Find the slope of the line represented by the table of values.
koban [17]
I dont know if im correct but i think its C
7 0
3 years ago
Other questions:
  • Identify the variables in the expression 4mn + 6m - 3
    6·1 answer
  • Consider the circle graph above. If 40 people surveyed said their favorite vegetable was cucumber, how many total people were su
    5·1 answer
  • On a set of blueprints, the scale is 1/2 inch = 4 feet. Find the actual length of a room that measures 2.8 inches on the bluepri
    8·1 answer
  • Solve the problem for x -3-(-8)-(-2)=x
    6·1 answer
  • Can you please help me? Keep it a little basic. (no decimals) Thanks for the help!
    14·2 answers
  • What is 2 X (6+ 2 + 8) -4
    15·1 answer
  • A rectangle has vertices (a,b), (c,b), and (a,c). Find the fourth vertex.
    10·1 answer
  • Mathieu grows specialty tomatoes that are much larger than typical tomatoes. The distribution of their weights is strongly skewe
    6·1 answer
  • Someone please helppp
    12·1 answer
  • Solve the following system of equations.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!