1. Logs...

Use logarithms to solve the equation for t.

2. 1. Isolate $e^{t/2}$.
2. Take $\ln$ of both sides.
3. Multiply both sides by 2.

3. i have no clue...

4. Originally Posted by djdownfawl
Use logarithms to solve the equation for t.
$A = C(1+Be^{t/2}) = C + CBe^{t/2}$

Can you isolate $e^{t/2}$ now?

5. no...

Look at it as if you were doing algebra. Once you get down to $e^{t/2}$, then take the logarithm of both sides and multiply both side by 2.