Answer:
C. 
Step-by-step explanation:
c
Answer:
y equal -7
Step-by-step explanation:
i think so but it will help you
Answer: The time taken by both of them if they work together is given by

Step-by-step explanation:
Since we have given that
Time taken by Blake to paint one room = 9 hours
Time taken by Ned to paint one room = 6 hours
Work done by Blake = 
Work done by Ned = 
Total work done by both of them together is given by

So, the time taken by both of them if they work together is given by

1-2 = -1
If that's what u mean