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If (a_n=9-4n), what is (a_5)?

Answer and explanation

Correct answer: -11

To find the fifth term, substitute n=5 in the formula: \(a_5=9-4(5)=9-20=-11\). Therefore, the correct answer is -11. The value -9 would result from incorrectly subtracting 18 from 9 instead of calculating 4×5 correctly. Exam tip: For an nth-term formula, substitute the value of n first, multiply, and then perform addition or subtraction.

Related tags

Sequences And ProgressionsNth TermSubstitutionLinear SequenceNegative IntegersMathematicsClass 9 Mcq

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