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Higher November 2021 Paper 2 Q18

18. The diagram shows Zac’s height from 8 to 18 years of age.

Graph of height (cm) from 120 to 180 against age (years) from 8 to 18; the curve rises from 135 cm at age 8 to 170 cm at about age 16.5, then stays level at 170 cm
(a) Find Zac’s rate of growth on his 17th birthday. [1]
(b) What is Zac’s average rate of growth per year between his 10th and 15th birthdays?
You must show all your working. [3]