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Let's make a table of the ordered pairs from the graph.

$n$ | $1$ | $2$ | $3$ | $4$ |
---|---|---|---|---|

$a_{n}$ | $56$ | $48$ | $40$ | $32$ |

$f(n)=a_{1}+(n−1)d$

$f(n)=56+(n−1)(-8)$

DistrDistribute $-8$

$f(n)=56−8n+8$

SubTermSubtract term

$f(n)=64−8n$

b