Evaluate the surface integral. s 1 + x2 + y2 ds s is the helicoid with vector equation r(u, v) = u cos(v) i + u sin(v) j + v k, 0 ≤ u ≤ 4, 0 ≤ v ≤ 4π

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