Under which operations are polynomials closed?

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.

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

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265