Final answer:
The growth factor of the exponential function f(x) = ((15)^x) is 15, as this is the base of the exponent and represents the amount by which the function grows over each unit interval for x.
Step-by-step explanation:
The student's question pertains to determining the growth factor of an exponential function, specifically f(x) = ((15)^x).
To find the growth factor, we look at the base of the exponent, which is 15 in this case. The growth factor is the amount by which a quantity multiplies itself over a given period of time. For the given function, the quantity is multiplied by 15 over each unit interval for x. Therefore, the growth factor for the function is 15.