What is the length of the dotted line in the diagram below? Round to the nearest tenth.
4.
5
5

What is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).