Question
Which of the following functions are exponential functions? For the exponential functions, identify if they represent exponential growth or decay.
a) f(x) = 2(3/4)^x
b) g(x) = 3(-5)^x
c) h(x) = 4x^7
d) j(x) = 59^(x+2)
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Evidence boundary
These classifications apply to the four formulas in PCC Practice 1 as functions over real inputs. The negative-base expression may have real values at selected inputs, but it is not a real-valued exponential function on all real numbers.