Robert rented a web address for his company's website. His contract required a fee of $15 a month for the web address. However, Robert receives a $0.10 discount for every friend he refers during a month. There is also a special new customer discount of 15% off the first month. Which expression can Robert use to calculate the first month's bill, if he refers f friends? 0.15(15 - 0.10f)

0.85(15 - 0.10f)

0.85(15 + 0.10f)

0.15(15 + 0.10f)

1foot = 12 inches; 1 yard = 3 feet

Prism m and pyramid n have the same base area and the same height. cylinder p and prism q have the same height and the same base perimeter. cone z has the same base area as cylinder y, but its height is three times the height of cylinder y. the figures and have the same volume.

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