Question

Write the explicit formula for the sequence, and use to evaluate for the given term.

Answer 1

Explanation:

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Answer 2

aₙ=a₁+d(n-1)

aₙ= -20 + 1/2(n-1)

a₉= -20 + 1/2(9-1)

= -20 + 1/2(8)

= -20 + 4

= -16