What does the A stand for in the compound interest formula A= P(1+1)^t?

A total interest
B total principle borrowed
C total interest and principal
D All american amount

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm