Consider the exponential function \(\displaystyle{y}={a}\cdot{b}^{{x}}\) is is an exponential growth if b>1 and exponential decay if 0 It is given that \(\displaystyle{y}={1.3}{\left(\frac{{1}}{{4}}\right)}^{{x}}\)

Since \(\displaystyle{b}=\frac{{1}}{{4}}{<}{1}\), the given function represents an exponential decay.