Question

The exponential function f(x)=3(2)^-x

a) Has a range of {y | yER}
b) Has a y-intercept at (0,1)
c) Represents exponential decay
d) Represents exponential growth

Answer 1

all pure exponential function have range (0,∞)

2^0 = 1, so f(x) has a y-intercept at (0,3)
2^-x shrinks, so (c)