Who got prodigy in this is my user name in pass word you can use it as long as you wont to but dont spend my coins ok

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

Pam buys a sleeve of ball bearings for her skateboard. each of the bearings is 1 1/5 inches wide. the sleeve is 9 3/5 inches long. how many ball bearings are in the sleeve? show your work.

Evaluate cos2θ for cosθ = square root of 3/2