Over which interval is the graph of f(x) = 1/2 x2 + 5x + 6 increasing?
a) (–6.5, ∞)
b) (–5, ∞)
c) (–∞, –5)
d) (–∞, –6.5)

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

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.