The third 2

The third term of an arithmetic sequence is -12, and the seventh term is 8. What is the sum of the first 10 terms?

Correct answer:

s =  5

Step-by-step explanation:

a3=12 a7=8 n=10  a7 = a3 + (73)d d=73a7a3=738(12)=5  a1=a32 d=(12)2 5=22 a10=a1+(n1) d=(22)+(101) 5=23  s=n 2a1+a10=10 2(22)+23=5



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