Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Geometric Sequences - Problem 5

Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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To find the tenth term, or more generally, the nth term, of a geometric sequence, we want to write the explicit formula that describes what we are given. First, we find the ratio by looking at what each term is multiplied by to get to the next term. You'll also need the first number in the pattern. From there, the nth term is found by raising r to the "n minus one" exponent, and then multiplying that result by the first term in the list.

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