3x + 9 = 90
3x = 90 - 9 = 81
x = 81/3 = 27
x = 27
A + B + C = 518 ft^3
A = 1/3B, or 3A = B
B = C
A + B + C = 518 ft^3
1/3B + B + B = 518
7/3B = 518
B = 518×3/7 = 222 ft^3
A = 1/3B = 1/3×222 = 74 ft^3
C = B = 222 ft^3
Hi im doing this test right now and what is the answer lol
12-13 I hope this helps ;)
