Pleasee pleeeaassee help. TY

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

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.

Find the value of x for which abcd must be a parallelogram -9-6x x-30