Graph the function f(x)=5(o.5)^{-x} and its reflection about the line y=x on the same axis, and give the x-intercept of the reflection. Prove that a^x=e^{x lna} . [Suggestion: type y=5(0.5^{-x}) {- 7 < x < 2} {0 < y < 7} in desmos, and then type its inverse function.]