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Math·Advanced Math·Nonlinear functions

hard

The exponential function $f$ is defined by $f(x)=a{b}^x$, where $a$ and $b$ are positive constants. If $f(s)=t$ and $f(s+1)=t-0.87t$, where $s$ and $t$ are constants, what is the value of $b$?

A

0.13

B

0.87

C

1.13

D

1.87