5.6^2 + 3.8^5 x 8.1^9 + 2.5^7
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Which expression is not a polynomial?

Which letters from the table represent like terms? a and b b and c a and d b and d

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?