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What expression is equivalent to 42x-56y

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if