Which function equation is represented by the graph? Responses f(x)=20(2.5)x f open argument x end argument equals 20 left parenthesis 2.5 right parenthesis to the power of x ​f(x)=20(1.5)x​ ​, f open argument x end argument equals 20 left parenthesis 1.5 right parenthesis to the power of x, ​ ​f(x)=20(1.4)x​ ​, f open argument x end argument equals 20 left parenthesis 1.4 right parenthesis to the power of x, ​ ​f(x)=20(2.25)x​ ​, f open argument x end argument equals 20 left parenthesis 2.25 right parenthesis to the power of x, ​