Describe the relationship between the unfinished puzzle and the missing piece

Evaluate cos2θ for cosθ = square root of 3/2

Erik buys 2.5 pounds of cashews. if each pound of cashews costs $7.70, how much will he pay for the cashews?

There are 8 movies that you would like to see currently showing in theatres. in how many different ways can you choose a movie to see this saturday and one to see this sunday?