A ball is thrown from a height of 197 feet with an initial downward velocity of 21 ft/s. the balls height h (in feet) after t seconds is given by the following h=197 -21t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

Pls the last one and it has to be like number 6