Margaret and donovan are twins. they have each kept track of their heights every year since they were 5.

margaret made a table to track her height in centimeters. (i wrote them as (x, y))
(5, 101); (6, 105); (7, 109); (8, 113); (9, 117); (10, 121)

donovan wrote his height as an equation. (h = height; a = age)
h = 105 + 4.25(a - 5)

compare their rate of changes. who had the fastest rate of growth?

a: donovan
b: margaret
c: both had the same rate of growth.
d: not enough information to determine who had the fastest rate of growth.