Need on !

which statement justifies that fact that (angle) aoc and (angle) cob are supplementary?

a) angle addition postulate
b) protractor postulate
c) linear pair postulate
d) vertical angles

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

This is about circle theorems. someone asap : (

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.