What should Mrs. Cho do next? Find a common denominator for the two fractions. Divide the numerator and denominator of the first fraction by x2 and y. Multiply the numerators, multiply the denominators, and then simplify. Multiply the first fraction by the reciprocal of the second fraction.

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