A private college allows local residents to use its athletic facilities, such as the gym and the pool, for a fee. The college charges a one-time registration fee of $25 and also charges a fee of $18 per semester of use. Write an equation in y=mx+b form. (y being the total cost and x being the number of semester.

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