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Answered

Find the sum of the first eight terms of the arithmetic sequence 5,7,9,...

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Answer:

96

Step-by-step explanation:

Sn= n/2 (2a1 + (n-1)d) n (number of terms)= 8

= 8/2( 2×5 + (8-1)2 ) a1 ( first term) = 5

= 4 ( 10 + (7) 2) d ( common difference) = 2

= 4( 10+ 14 ) Sn ( sum of the arithmetic sequence)= 96

= 4( 24 )

Sn = 96

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