I need help please. ​

Pete is making decorations for a dinner party. the instructions tell him to use 9 flowers for a medium-sized decoration. complete each statement to adjust the flowers for different-sized decorations based on these instructions.

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

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?