Under normal conditions, the atmospheric temperature drops 3.5°f per 1000 feet of altitude up to 40,000 feet. when the outside temperature is 80°f, the atmospheric temperature can be modeled by t(x) = − 3.5x + 80, where x is the altitude in thousands of feet.
a. graph the function and identify its domain and range.
b. find and interpret the value of x so that t(x) = − 25
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