Only 4 will get 7.find the radius of a circular lid with an area of 12in.². 8. solve by completing the square: a rectangular patio has a length of x + 6 m, a width of x + 8 m, and a total area of 400 m². find the dimensions to the nearest tenth. 9. solve the system of equations. { = ² + 9 { = 6 10. solve the system of equations. { = 4 +8 {² + 7 − 20

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