Combining functions

You can build a new function by combining two existing ones with arithmetic, like adding the constant function 70 to a decaying exponential, 70 + 100 x (1/2)^t, to model a cooling object: at t = 1, the temperature is 70 + 100(1/2) = 120 degrees, leveling off toward 70 degrees as t grows, instead of dropping to zero.

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