You can rewrite the differential equation as

This last expression looks like the one you describe. If you solve for A instead of t, you get

This is the same as your other answer.
Answer:
r = -11
Step-by-step explanation:
They are using two different functions.
Tell your math teacher that questions like these are loaded and should not be given as assignments.
Answer:
its fifteen fiths
Step-by-step explanation: