Question

an=2n+5 the what a8​

Answer 1

Answer:

S1=3=a

S2=5

a2=s2-s1=5-3=2

d= a2-a1=2-3=-1

a8=a+7d=3+7*-1=-4

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Answer 2

Answer:

a8 = 2 * 8 + 5

a8 = 16 + 5

a8 = 21