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Mathematics
Problem
For which value of
k
k
k
does the function
f
(
x
)
=
5
k
x
f(x)=5\,k^{x}
f
(
x
)
=
5
k
x
represent an exponential decay function? a)
k
=
−
2
k=-2
k
=
−
2
b)
k
=
1
k=1
k
=
1
c)
k
=
1
3
k=\dfrac13
k
=
3
1
d)
k
=
3
2
k=\dfrac32
k
=
2
3
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