Back to Recognize sequences as functions — Problem 2 · Task Set 5

HSF.IF.A.3 Tutor Intake — Sequences as Functions

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Grade 9·13 problems·~12 min·Common Core Math - HS Functions·group·hsf-if-a-3

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Concepts

A student graphs the sequence $a(n) = 3n - 1$ by plotting points and
then drawing a solid line through them. What is wrong with the student's graph?

The formula $a(n) = 3n - 1$ is incorrect for this sequence.

The graph should be plotted in Quadrant II, not Quadrant I.

The graph should show isolated points only, because the domain of a
sequence is a subset of the integers, not all real numbers.

The student should have used subscript notation $a_n$ instead of $a(n)$ .