B=(c-3a)/2
Should be the equation you get
Answer:
The area is 
Step-by-step explanation:
I assume that the figure is a square
The area of a square is equal to

where
b is the length side of the square
In this problem we have

substitute in the formula


Answer:
D. A solid
Step-by-step explanation:
1000/20 is the same as 100/2(you just removed a 0 from both of them)
10/2=5 add a 0
50