Verify the identity. cos (x - y) - cos (x + y) = 2 sin x sin y

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 =

What does the sign of the slope tell you about a line?

Yvaries inversely as x. y =12 when x=5. find y when x=4