The regression equation

C=200+400Y

where C is the number of calories and Y is the age in years, can be used to estimate the calories a toddler needs to consume each day to grow and develop at a healthy pace.

a. Use the regression equation to predict the necessary daily calorie intake of a toddler who is 2.5 years old.

b. Would you use the regression equation to estimate the necessary daily calorie intake of a teenager who is 14 years old? If so, what is the necessary daily calorie intake. If not, explain why.