Question

9. You have a record of your age x (in years) and your height y (in inches) on

each of your birthdays since you were born. Is this a function?

Answer 1

The y’s can be a duplicate

Answer 2

Explanation:

The y's can be a duplicate and g(x) can still be a function. Since travelling back in time is not possible, all most all ages along the x axis will produce a function as long as x>0.

It doesn't have to be much over 0 to start counting it. As soon as birth occurs height can be measured and usually is.