the normal to the curve y=x*3+6x*2-34x+44 at the point P(2,8) cuts the x axis at A and the y axis at B. show that the mid point of the line AB lies on the line 4y=x+9.​

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =