exam Maths Puzzle Numerical Ability

Hi, Can I have some help with this function?

Use f(x) = 2x - 8 and g(x) = 5x - 2 to evaluate the expression.
(a) f(g(-7))

(b) g(f(-7))

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A man rode a bicycle for 12 miles and then hiked an additional 8 miles.The total time for the trip was 5 hours. If his rate when he was riding a bicycle was 10 miles per hour faste 2.43x + 13.71 = 8.12x - 22.54