Find the possible value or values of r in the quadratic equation r2 – 7r – 8 = 0.

a. r = 8, r = –1 b. r = 2/3, r = 5 c. r = –10, r = 3 d.

Find the value of x for which the lines are parallel.

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

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