Determine the value of P​

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

Acircular hot tub located near the middle of a rectangular patio has a diameter of 48 inches. the patio measures 11 feet by 6 feet. what is the area of the patio that is not covered by the hot tub?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10