exam Maths Puzzle Numerical Ability

6x-5y=15

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exam Other Question

Solve V = 1/3Bh for B if V=112 and h=7

I able to set up the problem, but am getting confused on how to muplity the fraction with the variable. Thanks!!
Instructions: Perform indicated operations.

What is the solution for -4x^2(5x^4-3x^2+x-2)