V = L * W * H

= 15 * 12 * 10

= 1800

= 12 * 6 * 3

= 216

= 1800 + 216

= 2016
Hope that helps and you can remember the formula and steps for future use!
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Answer:
x= - 13
Step-by-step explanation:
2(3x+6) = 3(x-9)
6x+12 = 3x -27
-3x -3x
3x+12=-27
-12 -12
3x= -39
/3 /3
x= - 13