Question

the first term of an ap is -3 and the 10th term is 15 find S10​

Answer 1

Answer:

-5

Step-by-step explanation:

a = -3

a10 = a + 9d =15

-3+9d=15

9d=18

d=2

s10= n/2(2a+(n-1)d)

     =5/2(2.-3 + (5-1) 2)

      =5/2 (-6+8)

      =5/2 .-2

      =  -5

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