I need to find the surface area of a triangular pyramid but i’m not sure how

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

Amanager recorded the number of bicycles sold by his company each quarter. his projected sales after t years is given by the expression below. which of the following statements best describes the expression? a. the initial sales of 575 bicycles increases at the rate of 4% over 4 quarters. b. the initial sales of 575 bicycles increases at the rate of 18% over 4 years. c. the initial sales of 575 bicycles increases at the rate of 4% over t quarters. d. the initial sales of 575 bicycles increases at the rate of 18% over t years.

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?