A machine can make 56 parts in 4 hours. It can also make 70 parts in 5 hours. Write an equation that relates the number of parts the machine can make and the time in hours. Predict how many parts the machine can make in 9 hour and 30 minutes.

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