A person standing close to the edge on top of a 128-foot building throws a ball vertically upward. The quadratic function h(t) = - 16t? + 112t + 128 models the ball's height about the ground, h(t), in feet,
t seconds after it was thrown.
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Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.