First of all this question is awesome.
second 317 x 25 = 7925
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3x + 2y = 39
5x - y = 13
Multiplying the last by two:
10x - 2y = 26
Adding to the first
13x = 65
x = 5
y = 5x-13 =25-13=12
Check:
3(5)+2(12)=39 good
5(5)-12=13 good
Answer: x=5, y=12
https://www.wolframalpha.com/
V = 4/3 * 3.14 * 9^3 = 3052.08
Answer is B
