Please help solve by using multi step trig

Which expressions are equivalent to -6 + 3m

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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