book Maths Puzzle Numerical Ability

If g(x) = 2x - 3, D = {Reals}, and h(x) = x squared + 1, D = {Reals}, find:

a) (g + h)(-2)
b) gh(1/2)

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book Other Question

Need help solving:

-3x +3/4=1/8

Thanks
Solve the inequality:

(4/3)(x+1)≤(1/2)(x-3)