For the exponential function f, the value of f(1) is k, where k is a constant. Which of the
following equivalent forms of the function f shows the value of k as the coefficient or the
base?
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f(x) = 50(1. 6)+1
f(x) = 80(1. 6)
f(x) = 128(1. 6)-1
f(x) = 204. 8(1. 6)-2
x=