9. A rental car agency charges a flat fee of $34.00 plus $2.75 per day to rent a certain car. Another agency charges a fee of $30.50 plus $3.50 per day to rent the same car.
Which system of equations represents the cost c for renting a car at each agency for
d days? Find the number of days for which the costs are the same. Round your
answer to the nearest whole day.

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