exam Maths Puzzle Numerical Ability

Help I do not understand this at all! Thanks so much for any help given.
It says find the function value f(x)=x3
f(-2)= ?

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exam Other Question

How do you simplify this fraction?

2x^2 - 32
__________
x - 4
"Solve each equation by eliminating the decimals":

0.5b + 3.4 = 0.2b + 12.4



Thank you!