Cumulative Assessment
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Use the equation for an arithmetic sequence.
C
We have been given the graph of an arithmetic sequence.
Let's list the terms of the sequence and identify the first term and the common difference.
We notice that the first term a_1 is 24 and that the common difference of the sequence is - 3. To find a function representing this sequence we will substitute these values into the equation for an arithmetic sequence. a_n= a_1 + (n-1) d ⇓ a_n= 24 + (n-1)( - 3) To identify the correct option we need to rewrite this equation.
This matches option C.