Pls help me solve this

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

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

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid