The function ฦ is defined by ฦ(x) = (x + 3)(x + 1). the graph of ฦ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ฦ?
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