Can u explain to me how to get the answer? ?

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.