If f ( x ) f(x) is an exponential function where f ( 0.5 ) = 1 f(0.5)=1 and f ( 1.5 ) = 55 f(1.5)=55, then find the value of f ( 2.5 ) f(2.5), to the nearest hundredth.

Samantha had 75 necklaces to cell by the end of the first week there was only 57 necklacesleft by the end of the second week there were only 38 necklaces left find the percent decrease in the number of necklaces by the end of the first week