book Maths Puzzle Numerical Ability

Evaluation the expression for the given value of the variable:

1. 8a when a=4

2. c+15 when c=12.5

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book Other Question

My son is having a problem solving the following equation.
m^3-5m=2m^2-3

I'm not sure how to handle the exponents so I get lost solving this with him. You're help is appreciate hi, i need help to simplify an expression

x^2+5x-36/8x^2+35x+12 * 64x^2-9/8x^2+69x-27

any help out there:)