When a cannonball is fired, the equation of its pathway can be modeled by h=-16t squared + 128t. find the time it will take for the cannonball to reach the ground.

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.