For altitudes up to 36,000 feet, the relationship between ground temperature and atmospheric temperature can be described by the formula t = −0.0035a + g, in which t is the atmospheric temperature in degrees Fahrenheit, a is the altitude, in feet, at which the atmospheric temperature is measured, and g is the ground temperature in degrees Fahrenheit. Solve the equation for a. If the atmospheric temperature is −21.4 °F and the ground temperature is 50 °F, what is the altitude? The equation for a is a = .

If the atmospheric temperature is −21.4 °F and the ground temperature is 50 °F, then
a =
feet.