Which is an exponential growth function? f(x) = 6(0.25)x f(x) = 0.25(5.25)x f(x) = –4.25x f(x) = (–1.25)x

For this case, the first thing we must observe is that we have functions of the form:
 y = A (b) ^ x
 Where
 A: initial amount
 b: growth rate (b> 1) or decrease (b <1)
 x: a variable that is usually time.
 We have then:
 f (x) = 0.25 (5.25) x
 Where,
 b> 1
 Therefore, the function grows.
 
 f (x) = 0.25 (5.25) x