Study the following diagram of circle c, where ab
is a diameter that bisects the chord ef

(the link to the image of the diagram)^
if m∠acf=2(7x−4), what is the value of x?
enter the correct value.

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If the scale factor between two circles is 2x/5y what is the ratio of their areas?

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.