Answer
$3.544$
Work Step by Step
In an exponential model $n(t)=Ab^{t}$, the value for $n(t+1)$ is obtained by multiplying $n(t)$ with b.
(Similar to geometric sequences and their common multiplier between successive terms.)
The blank should be:
$b=3.544$
Calculation:
$\displaystyle \frac{n(t+1)}{n(t)}=\frac{Ab^{t+1}}{Ab^{t}}=b$
