Radius=7in The area is ( )in^2 (round to the nearest tenth as needed.)

plz help me out plz

Place the following steps in order to complete the square and solve the quadratic equation,

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.