Final answer:
a) Y = 11x. The equation for Phillip's maple tree growth is Y = 11x.
Step-by-step explanation:
The equation for Phillip's maple tree growth if it grows eleven inches every year is: Y = 11x.
This equation represents a linear relationship between the years (x) and the growth in height (Y).
For example, if the tree grows for 3 years, the height would be: Y = 11 imes 3 = 33 inches.