The graph represents the average heights of boys in the United States from age two to age ten. A line of best fit has been drawn through the data.​

0.02040816326

see attached

step-by-step explanation:

given the function as;

write the equation replacing f(x) with y

form   and fill a table containing values of y with corresponding values of x

you can take a range for   values of x as -3≤x≤3

solving for x=-3

for x=-2

repeat the same procedure to get the values of y for the remaining ,x=-1 to x=3

plot the values of y against values   of x and obtain the following graph

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: