The correct response is:
Austin should find where one curve is above the other curve on the graph. The growth rate of \( f(x) = 1.3^x \) is only greater than the growth rate of \( g(x) = 1.3x \) to the right of their right-most intersection point.
This is because \( f(x) = 1.3^x \) represents an exponential function, which will eventually grow faster than the linear function \( g(x) = 1.3x \). Initially, both functions may be close or intersect at certain points, but as \( x \) increases, \( f(x) \) will surpass \( g(x) \).