The answer is D an = -5n + 12
Use the formula an = a1 + d(n - 1) to solve
an = 7 + (-5)(n - 1)
an = 7 + (-5n +5)
an = -5n + 12
Step-by-step explanation:
there it is
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Answer:
s=19
18s-17s+1=20
s+1=20
s=20-1
