9. two burritos cost $0.82 and five burritos cost $2.10. which is a better buy? by using unit rate

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

1. evaluate 8x(2)y9(-2) for x=-1 and y=2 2. simplify the equation. -() 3. simplify the expression. [tex]\frac{5}{x(-2) y9(5)}[/tex]

Y= a(x-3)squared-1 what is the value of a