Discover Questions

Prove that Sin( [π/2] - x) = cos(x)? If adjacent angle is 4, opposite is 1. What is the hypotenuse? 20 balloons have to be divided among between group a and group b inthe ratio 2:3. how many ballons will each group recieve? I know the United States "purshased" Alaska from Russia but why isn't it just part of Canada? What's the population of the Moon?