the atmospheric pressure in millibars at altitude x meters can be approzimated by the following function. the function is valid for values of x between 0 and 10,000. f(x)= 1038(1.000134)^-x when x between 0 and 10,000. a. What is the atmospheric pressure at sea level? b. The McDonald Observatory in Texas is at an altitude of 2000 meters. What is the approximate atmospheric pressure there? c. As altitude increases, what happens to atmospheric pressure?