Question #1: if cos x = 7/25, and 0 < x < pi/2, what is sin(x - 3pi/2) question #2: if tan x = sqrt(3), and 180(degrees) < x < 270(degrees), what is sin(x - 210degrees)?

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