Find the x in the parallelogram there’s an x in the left corner and 73 degrees in the right bottom corner

Any two consecutive angles of a parallelogram are same side interior angles of parallel lines cut by a transversal, so they are supplementary.

Supplementary angles are two angles whose measures add up to 180 deg.

x + 73 = 180

x = 107

Total = Principal * (1 + rate/n)^(n*years)
where "n" is the number of compounding periods per year
Total = 6,000 * (1 + .06/4)^(4*5)
Total = 6,000 * (1 + .015)^(20)
Total = 6,000 * 1.3468550066
Total = 8,081.13

Source:
http://www.1728.org/compint.htm