The price of a notebook has dropped to $3.15 today. yesterday's price was $3.40. find the percentage decrease. round your answer to the nearest tenth of a percent.

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

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 =