The statement on the bottom left is correct. (6 students studied for 20 to 24 hours)
The answer to this question whould be that the area is 20
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)
The area formula for a triangle is 1/2 (base * height)