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1) For the equation $\displaystyle N= 1000e^{-0.115t}$
a) Find $\displaystyle t$ when $\displaystyle N =500$
$\displaystyle 500= 1000e^{-0.115t}$
Now solve for $\displaystyle t$
a) Find $\displaystyle N$ when $\displaystyle t =28$
$\displaystyle N= 1000e^{-0.115\times 28}$
Now solve for $\displaystyle N$