The following diagram shows a right-angled triangle, ABC, where CosA=5/7 (a) Show that SinA=sqrt24/7
(b) Find cos 2A

Name these type of angles shown check all that applies

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.