Answer:
x=-7
Step-by-step explanation:
3/4x+63/4=21/2
3/4x=-42/8
x=-7
(4)2 + 7= 15.
15-7=8.
I would say that number is 4 because 4+4= 8, and 8+7 =15.
The answer is D, the number of cubic units would decrease.
<span>0.28571428571 that should be your percentage hope this helps.</span>