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Question

Find the sum of the first $80$ terms of the arithmetic sequence with first term $12$ and common difference $-3$.

Solutions

VerifiedSolution A

Solution B

Answered 1 year ago

Step 1

1 of 5In this task, we are given that the first term

$a_1=12$

and the common difference

$d=-3.$

We have to determine the sum of the starting $80$ terms of this arithmetic sequence.

Answered 2 years ago

Step 1

1 of 5To determine the sum of the first $80$ terms of the arithmetic sequence with first term is $12$ and the common difference $-3$ we will use this equation below.

$s_n=\frac{n}{2}(a_1+a_n)$

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