All of them are wrong its 91 but if you want click or circle 90
In the equation

divide both sides by
to get

Take the base-3/2 logarithm of both sides:

Alternatively, you can divide both sides by
:

Then take the base-2/3 logarith of both sides to get

(Both answers are equivalent)
Answer:
Just put it in Geogebra classic. It's an app that helps very much with functions!