Find f'(x)
f(x)= (e^2x-1) + e^2
f(x)= ((x^2)-1)/((x^2)+1)
f(x)=(1+x)/(1+(e^x))

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earn $75 in interest.how much interest will she earn during the following year?