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Let H(t) = 68 + 93(0.91)^t give the temperature of a cup of coffee in degrees Fahrenheit t minutes after it is brought to class.
1 Find formulas for H(t + 15) and H(t) + 15.
2 Graph H(t), H(t + 15), and H(t) + 15.
3 Describe in practical terms a situation modeled by the function H(t + 15).