Hey y’all please help me.

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

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

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase