Answer:
5
Step-by-step explanation:
A function
[tex]a \times {b}^{x} [/tex]
where a is the initial value and b is the multiplicative rate of change.
In the function,
[tex]f(x) = 2 \times {5}^{x} [/tex]
5 is the value of b so
5 is the multipicative rate of change
