A ball is thrown in the air. The relationship between the amount of time the ball is in the air in seconds (t) and the ball's distance above the ground in feet (h) is represented by the equation below. h = - 16t ^ 2 + 30t + 4

How many seconds will it take for the ball to hit the ground?

a. 1/8
b. 1/4
c.2
d.4

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.