The formula for this is A= a + b/2 x h.
There are 23 square green blocks in the figure, and the note up in the corner
shows us that each square has (1 inch x 1 inch) = 1 square inch of area.
You ought to be able to handle it from here.
36 months = 3 years
34,100*(1.04)^3 = $38357.86
The simpliest way to do this is to turn both fractions into decimals
7/10 goes to 0.7 and 2/5 goes to 0.4
then the equation would be 0.7x + 20 = 0.4
hope I've helped!
