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
Alborosie
3 years ago
9

Erica can paint her room 5 hours .If she had her friend Rachel help her , they can paint the room together in 3 hours .How long

would it take for Rachel to paint the room alone , if Erica wanted to go play tennis for the afternoon ?
Mathematics
1 answer:
LUCKY_DIMON [66]3 years ago
4 0

Answer:

7 hours 30min

Step-by-step explanation:

Step one :

Given data

We are told that Erica can paint 1 room in 5hours

Her work rate is 1/5 room per hour

And also with the assistance of her friend they can paint 1 room in 3 hours

Hence their combined work rate is 1/3 room per hour

Step two

The combined work expression is

1/A+1/B=1/T

Where A=Erica's work rate

B=Rachael's work rate

T=combined work

1/5+1/B=1/3

1/B=1/3-1/5

1/B=5-3/15

1/B=2/15

B=15/2

B=7.5 hours

It will take Rachel 7 hours 30min to paint the room

You might be interested in
Dimple volunteered 32 hours last month at a local animal shelter. This is 20% of the total hours that she has volunteered this y
vazorg [7]

If she was to volunteer 32 hours and it is worth 20%, then that means 32 hours is 1/5 of her yearly hours. If you were to multiply her volunteer hours by five, then you are getting the year number of hours she has volunteered.

32 x 5 = 160

So, she volunteers 160 hours this year.

8 0
2 years ago
In 2002, 946 million telephones with cords were sold. Each year after that, the number of the number of corded phones fell by ap
Kisachek [45]

The companies being considered are:

The company that is concerned with corded telephones

The company that is concerned with cellphones

Let x represent the number of years since 2002 and y represent the total number of accounts

From the information given,

Considering the first company,

Initial number of accounts = 946 x 10^6

The number of accounts fell by approximately 28 million per year. This means that in x years, the number of accounts that would have been lost is

28 x 10^6 * x

= - 28x x 10^6

It is negative because it is reducing

The slope intercept form of a linear equation is expressed as

y = mx + c

where

m = rate of change

c = y intercept of value of y when x = 0

By comparing with the given scenario,

4 0
1 year ago
Show that 3/5 id bigger than 5/9
SashulF [63]

Step-by-step explanation:

the common denominator for these two is 45, as you have to times 5 by 9 to get this you will have to times 3 by 9 aswell so that fraction would be 27/45.

as you have to times 9 by 5 to get 45 you will have to times 5 by 5 which is 25 so that fraction would be 25/45

3/5=27/45 5/9=25/45

27 is bigger than 25

3 0
3 years ago
PLEASE HELP ME I NEED HELP ASAP!!!! PLEASE HELP ON A AND B
valina [46]

Answer:

<h2>a) x = 16 and y = 6</h2><h2>b) P = 864 in</h2>

Step-by-step explanation:

a)

The opposite sides of the rectangle are of equal length.

Therefore we have the system of equations:

\left\{\begin{array}{ccc}3y=2+x&\text{subtract 2 from both sides}\\3x=2+x+5y&\text{subtract x from both sides}\end{array}\right\\\\\left\{\begin{array}{ccc}3y-2=x&(*)\\2x=2+5y&(**)\end{array}\right

Substitute from (*) to (**):

2(3y-2)=2+5y\qquad\text{use distributive property}\\\\(2)(3y)+(2)(-2)=2+5y\\\\6y-4=2+5y\qquad\text{add 4 to both sides}\\\\6y=6+5y\qquad\text{subtract 5y from both sides}\\\\\boxed{y=6}

Put the value of y to (*):

x=3(6)-2\\\\x=18-2\\\\\boxed{x=16}

b)

Calculate the width and the length:

3x = 3(16) = 48\\\\3y = 3(6) = 18

The perimeter:

P = 2w + 2l\\\\P = (48)(18)=864\ in

8 0
3 years ago
Which medicinal product is made using animal products?
raketka [301]

Answer:

C. Rose oil

Step-by-step explanation:

Which medicinal product is made using animal products?

A. Flu vaccine

O

B. Aspirin

C. Rose oil

O

D. Morphine

SUBM

3 0
4 years ago
Other questions:
  • A pump currently contains 4 7/8 gallons of water but needs to be filled to capacity. The capacity of the pump is 9 5/8 gallons.
    5·1 answer
  • the autopilot feature on a ship is designed to maintain a set speed if the ship's are actual speed never varies by more than fiv
    12·1 answer
  • The absolute value of 64
    12·1 answer
  • The following function represents the value of a motorcycle, in dollars, after x years: f(x) = 19,000(0.91)x
    13·2 answers
  • please explain your answer( btw me and my family ahre an account so if u see omebody answer an question without the answer its m
    10·2 answers
  • Pls help extra points
    13·2 answers
  • Ted left at 8:00 a.m to walk to the dog park. It took him 30 minutes to get there.
    5·2 answers
  • On an airplane, there are two seats on the left side in each row and three seats on the right
    7·2 answers
  • The population of a certain city increased by 18,000 people.
    6·1 answer
  • Need help with AP CAL
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!