Mike sold 1/2 of his comic book collection. He then bought 8 more. He now has 18 comic books. How many did he begin with? Help :(

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

Are the corresponding angles congruent? explain why or why not.

Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.