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 -65.5°f and the ground temperature is 57°f, what is the altitude?