Find S_10 for -1+-7+-13+-19+... Arithmitic Sequences for Algebra 2, thank you

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aruv | High School Teacher | (Level 2) Valedictorian

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Given sequence is in arithmetic series  its first term is a= -1 and commn differnce is d= (-7+1)=-6

Sum of n terms of an AP wth a frst term and comn difference d s