Could someone bless me up with this math problem? If so really appreciated. Mainly stuck on 12 but could also clarify 11 for me to make sure I did it right.

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?

Apark is in the shape of a rectangle. the park authorities are planning to build a 2-meter-wide jogging path in the park (shown as the shaded region in the image). what is the area of the jogging path? plz

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?