Answer: 
Explanation:

Multiply by t on both sides.


Now divide by I to isolate t.


The gold leaf (not foil) is to give a sculpture or a painting appeal. Without it, it would discolour quicker.The gold leaf can be easily removed if needed to be.
It would most likely be a observation or hypothesis
Below is the mechanism showing the hydrolysis of Iminium Ion into aldehye. The arrows are shown in RED.