Answer/Step-by-step explanation:
The constant rate of change that occurs can be calculated using the formula,

Let any 2 given pair values represent (x, y).
Thus, let's use (3, 3) and (5, 4.5)
Let (3, 3) = (x1, y1)
(5, 4.5) = (x2, y2)
Rate of change =

Rate of change = 0.75
The rate of change, 0.75, means in terms of growth, the height of the plant increases by 0.75 inches every week.