Use the graph on the right to answer the following questions. 35- + a. Estimate the pressure at altitudes of 9,000 feet, 18,000 feet, and 21,000 30 (0,29) feet. b. Estimate the altitudes at which the pressure is 23, 19, and 13 inches of 25- (5000.24) (10 000,21) mercury. 20- Atmo. pressure (in. of mercury) (20900, 15) c. Estimating beyond the boundaries of the graph, at what altitude do you 15 think the atmospheric pressure reaches 5 inches of mercury? Is there an 10- altitude at which the pressure is exactly zero? Explain your reasoning. 30000,9) 0 10,000 20,000 30,000 Altitude (feet) a. The pressure at 9,000 feet is inches of mercury, the pressure at 18,000 feet is inches of mercury, and the pressure at 21,000 feet is inches of mercury. (Round to the nearest integer as needed.)