Unit Test Answers

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Which of the following sequences is arithmetic?

3, 9, 15, 21, 27, . . .

3, 9, 17, 27, 39, . . .

3, 9, 27, 81, 243, . . .

What is the explicit rule for the arithmetic sequence 3, 9, 15, 21, 27, . . . ?

an = 3 + (n – 1)6

an = 3 + (n + 1)6

an = 6 + (n – 1)3

an = 6 + (n + 1)3

An explicit rule for a sequence tells how to find an as a function of .

the first term, a1

the next term, an+1

the term number, n

the previous term, an–1

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