Write the function f, of, t, equals, 320, e, start superscript, minus, 0, point, 4, t, end superscriptf(t)=320e
−0.4t
in the form f, of, t, equals, a, left bracket, one half, right bracket, start superscript, start fraction, t, divided by, k, end fraction, end superscriptf(t)=a(
2
1
)
k
t