Find the difference between 7/10and 14/15

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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.

Select the correct answer and solve for y