Answer:
12
Step-by-step explanation:
Legs of 45-45-90 are equal so 4x-12=x+6.
3x=18, x=6
Plug back in and the length is 12
V=πr2*h /3
answer is 9/16 (9 over 16) Decimal form 0.5625
0, 4, 7, 9, 11 those r the answers in order