The atmospheric pressure p on a weather balloon decreases with increasing height. This pressure, measured in millimeters of mercury, is related to the number of kilometers h above sea level by the function p = 780(2.7) - 0.143h Complete parts a and b below. . .. a. Find the atmospheric pressure at a height of 5 kilometers. millimeters of mercury (Round to the nearest tenth as needed.) b. Find the atmospheric pressure at a height of 9 kilometers. millimeters of mercury (Round to the nearest tenth as needed.)