5) Find A1 if A8=54 and A9=60
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Answer:
To find the common difference (d): a₉ - a₈ ⇒ 60 - 54 = 6
a₁ = ? d = 6 a₉ = 60
an = a₁ + (n-1) (d)
a₉ = a₁ + (9-1) (6)
60 = a₁ + (8) (6)
60 = a₁ + 48
a₁ = 60 - 48
Step-by-step explanation:
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