P=14.63⋅0.8 a space, p, equals, 14, point, 63, dot, 0, point, 8, start superscript, a, end superscript atmospheric pressure, measured in pounds per square inch (psi)(\text{psi}) (psi) left parenthesis, p, s, i, right parenthesis is the force exerted by earth's atmosphere over a given area. the atmospheric pressure, pp p p , exerted on an airplane flying at an altitude of aa a a miles above sea level can be approximated by the model shown above. what is the best interpretation of 0.8a{0.8^a} 0.8 a 0, point, 8, start superscript, a, end superscript in this equation?