Find the area of the base b of the solid

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.