Can you help please? Try to hurry due soon

39

Step-by-step explanation:

it says it in the problem, "monthly membership fee of $39 per month

Step-by-step explanation:

the cost is 39 per month,  that is the rate of change also

a net is a diagram that shows a “flattened” view of a solid. in a net, each face and base is shown with all of its dimensions. a net can also serve as a pattern to build a three-dimensional solid.

a pyramid is a three-dimensional object with a base that is a polygon and triangular faces that meet at one vertex.

" the net of a triangular pyramid consists of four triangles. the base here we are given of the pyramid is a equilateral   triangle, and the lateral faces are also triangles "

f is the midpoint of