find the 10th term and sum of 15 terms of the arthmetic progrssion -8 , -6 , -4​

1 thought on “find the 10th term and sum of 15 terms of the arthmetic progrssion -8 , -6 , -4​”

1. Step-by-step explanation:

   1. a= -8

   d= -6 + 8

   d= 2

   t10 = -8 +(10 -1)2

   -8 +18

   t10 = 10

   S15 = 15/2 * ( 2-8 + 15 -1* 2)

   15/2 ( -6 + 28)

   15/2 *22

   15*11

   S15= 165

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