At the beginning of the day, there are 64 ounces of water in Todd's water bottle. At the end of the day, there are 0 ounces of water in his bottle. What integer represents the change in the amount of water in Todd's water bottle?

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.