Working together, rocco and giulia can paint a room in 3 hours. it would take rocco 7 hours to do it alone. what is giulia's rate of work in parts per hour?

B :  3/7 + 3r = 1

Step-by-step explanation:

Rocco:  of the job per hour

Giulia:  of the job per hour

Together:  of the job per hour

Rocco + Giulia = Together

+  =  

+  =  

3x + 21 = 7x

      21 = 4x

It will take Giulia  hours to paint the room by herself.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right