What is the area of a quadrilateral with vertices at (1 ,-1), (5 ,-1), (1, 5), (5, 5)?

(! ) three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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