For the function f(x)= ab^x, what are the possible values for b if the function is an exponential decay function? (There are two) a) 2^-1

b) 2-0.9999

c) square root of e

d) square root of 0.9

e) 1.5

The customer price index(cpi), which measures the cost of a typical package of customer goods,was 208.8 in 2011 and 244.1 in 2016.let x=11 corresponding to the year 2011 an estimate to cpi into 2013 and 2014. assume that the data can be modeled by a straight line and the trend to continue idenfinitely.use data points to find such a line and then estimate the requested quantities