2. The equation h=-5t? + 20t + 1 models the height, h metres, of a baseball as a function of time, t seconds, since it was hit. The ball
hit the ground before a fielder could catch it
(a) How long was the baseball in the air, to the nearest tenth of
a second? (2 decimal places)
(b) For how many seconds was the height of the ball at least
16m? (2 decimal places)

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

Consider the polynomials given below. p(x) = x4 + 3x3 + 2x2 – x + 2 q(x) = (x3 + 2x2 + 3)(x2 – 2) determine the operation that results in the simplified expression below. 35 + x4 – 573 - 3x2 + x - 8 a. p+q b. pq c. q-p d. p-q

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables