Please explain each step!

PART I

Generally speaking, arc length and surface area integrals are difficult to compute exactly since the integrands often do not have an antiderivative in terms of common functions. So approximation methods are used (such as the Trapezoidal Rule) to get an estimate of the integral. But, for all the problems below, the functions have been selected so that the integrals can be done exactly. 1. Compute the length of the curve ffx) = xg, for {J