The united states exports over 200 billion pounds of coal how many tons does the united states export

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 commission on a $590.00 sale if the commission is 15%.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'