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I thought rate of change was derivative...

I dont know:(

rate of change is derivative

What did you get as an answer?

I think he thought you were looking for the interest rate

\[A=P(.77)^x \\ \frac{A}{P}=(.77)^x \]
P is a constant
take ln( ) of both sides

this will allow you to bring down that power of x

and then differentiate both sides

ok:)

I got 23% as an answer?!

wait?
does that mean you aren't looking for rate of change and you are looking for interest rate?

no! I think i am looking for rate of change. Why dont we just try out both?

−0.13%
−13%
0.23%
−23%
these are the answer choics

none of those are the rate of change
so you must be looking for interest rate

yes :)

-23?

yes 77-100 is -23

so 77%-100% is -23%

Thanks :)