If f(a) = k, then which of the following must be true? f(k) = a f -1(k) = a f -1(a) = k

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Me with geometry ! in this figure, bc is a perpendicular bisects of kj. dm is the angle bisects of bdj. what is the measure of bdm? •60° •90° •30° •45°

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.