Answer:
3000 cm^3.
Step-by-step explanation:
If the top number is 15 it's
15 * 20 * 10
= 3000 cm^3.

We need to solve for x, we need to get x alone

Lets start by removing -5
Add 5 on both sides


Now to isolate x , we need to remove the square from x
To remove square , take square root on both sides

square and square root will get cancelled

So
and 
Let x be the amount of weeks.
60 + 7x = 120
60 - 60 + 7x = 120 - 60
7/7x = 60/7
x = 8.571428571
Answer: (-3,4) and (9,20)
I think these two points will make the answer you have been looking for.
Sorry idk, but I’ll try to do it