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Asceline0303go
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Find the sum of the first 15 terms of the arithmetic sequence: 10, 15, 20, 25, … ? Find the sum of the first 11 terms of the arithmetic sequence: −4, 3, 10, 17, … ?​

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Iamian749go

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a) 10, 15, 20, 25, ...30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80

The 15th term is 80.

b) -4, 3, 10, 17, ...24, 31, 38, 45, 52, 59, 66

The 11th term is 66.

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