Let S be the set of all real values of x with 0 < x < pi/2 such that sin x, cos x, and tan x form the side lengths (in some order) of a right triangle. Compute the sum of tan^2 x over all x in S.

Can any one me with the answers to these questions asap?

Clara schumann is buying bagels for her coworkers, she buys a dozen bagels priced at $5.49 a dozen. the bakery's cost for making the bagels is $2.25 per dozen. what is the markup rate based on selling price on a dozen bagels?

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.