Plz help me right now

Use the function nest to evaluate p(x) = 1 + x + · · · + x50 at x = 1.00001. (use the matlab ones command to save typing.) find the error of the computation by comparing with the equivalent expression q(x) = (x51 − 1)/(x − 1).

What situation is an example of an observational study

For which pair of functions is (gof)(a)=|a|-2?