HELP!
The equation shown is a model developed by a researcher, where x represents the height, in inches, of a 36-month-old boy, and y represents his maximum height, in inches, as an adult.
y= 3.5x - 60
Part A
A 36-month-old boy has a height of 36 inches. Based on the model, what is his expected height, in inches, as an adult?


Part B
Jack and Kris are 36-month-old boys. Jack is exactly 1 inch taller than Kris.

Based on the model, how many inches taller is Jack expected to be than Kris is expected to be when they are adults?


Part C
An adult male has a height of 73 inches. Based on the model, what was his height, in inches, when he was 36 months old?

Part D
Bill and Ryan are adult males. Bill is exactly 10.5 inches taller than Ryan. Based on the model, how many inches taller was Bill than Ryan when they were 36 months old?