A ball is thrown from a height of 141 feet with an initial downward velocity of 21 ft/s. The ball's height h (in feet) after t seconds is given by the following. h=141-21t-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.)

Out of the 150 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 of those students also signed up for canoeing. use a two-way table to organize the information and answer the following question: approximately what percentage of students signed up for neither canoeing nor trekking?