EXTRA POINTS AND BRAINLST PLEASE HELP MEEE

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 =

We just started the introduction into circles and i have no idea how to do this.

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625