The expression - 250 + 16z represents a submarine that began at a depth of 250 feet below sea level and ascended at a rate of 16 feet per minute. What was the depth of the submarine after 9 minutes?

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.