Please help me with this i’m going to fail!

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.