Answer:
(a)
-- The equation
(b) 31 inches
Explanation:
Given
See attachment
Solving (a): The equation of the trend line.
We start by calculating the slope (m)

Where


So, we have:



The equation is then calculated using:

Where:



Open bracket


(b) The height of a 2 year old.
To do this, we substitute 2 for x in




The prediction is 31 inches