Please please help I really need this done and I don’t get it

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Carly stated, “all pairs of rectangles are dilations.” which pair of rectangles would prove that carly’s statement is incorrect?

If the function m(x) has the point (5,2) on its graph name a point that would be on the funtion m(5x)