IF CORRECT I WILL MARK BRAINLIEST Select the correct answer.
Philip is snorkeling along a coral reef. He’s wearing an altimeter, which tracks his elevation. Philip snaps a picture of the reef at an elevation of --10 1/2 feet. Then he spots a nurse shark and swims to it for a closer look. By the time he reaches the shark, his elevation changes by

--3 1/2 feet. What is Philip’s elevation when he reaches the shark?

O-7 feet
O-8 feet
O-13 feet
O-14 feet

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