book Maths Puzzle Numerical Ability

Please help me solve this on Functional notation:

For the function f(y)=-3y-2, find f(-5)

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book Other Question

this one i found confusing!! please simplify the fraction
4t2 - 16 / 8 / t - 2 / 6

A. (t-2)(t+2)(t-2) / 3
B. 3(t+2)
C. 3(t-2)
D. (t-2)(t+2)(t-2) / 12
How do i solve this multi-step equation?




4 + x -2(x-6)= 8