Suppose the Fahrenheit temperature x miles above ground level is given by the formula T(x) = 85

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Suppose the Fahrenheit temperature x miles above ground level is given by the formula T(x) = 85 - 19x. 

(a) Use the intersection-of-graphs method to esti- mate the altitudes where the temperature is below freezing. Assume that the domain of T' is 0 ≤ x ≤ 6. 

(b) What does the x-intercept on the graph of y = T(x) represent? 

(c) Solve part (a) symbolically.

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