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If aₙ = 5n + 3, which term is equal to 88?

Answer and explanation

Correct answer: n = 17

This question applies an explicit nth-term rule in reverse: instead of finding a term from n, we find n from a given term value. Set 5n+3=88 because the required term equals 88. Subtract 3 from both sides to obtain 5n=85, then divide by 5 to get n=17. Thus 88 is the seventeenth term, so option C is correct. Substitution verifies the answer: a₁₇=5(17)+3=85+3=88. The alternatives do not satisfy the equation: n=15 gives 78, n=16 gives 83, and n=18 gives 93. Maintaining the equality during each inverse operation is the essential algebraic reasoning.

Related tags

SequencesNth-TermLinear-EquationTerm-NumberClass-9Nth TermSequences And ProgressionsMathematics

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