Which proves that exponential functions grow by equal factors over equal intervals? given: x = 5, y = ab5 x = 3, y = ab3
a) quotient of the values of y = b2 and δx = 2
b) quotient of the values of y = ab2 and δx = 2
c) quotient of the values of y = b2 and δx = −2
d) quotient of the values of y = ab2 and δx = −2