The recursive formula a2=18.5, an-1+1.5 models the number of people, in millions, that own a smartphone in the us, n years after 2014. write an equivalent explicit formula for the situation.

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe