Which of the following represents the zeros of f(x) = 3x3 − 10x2 − 81x + 28? (2 points) Select one:
a. 7, −4,1 over 3
b. 7, −4, −1 over 3
c. 7, 4, 1 over 3
d. 7, 4, −1 over 3

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