Question

if an=3+4n value of s3 is?
also comment if you are sure​

Answer 1

Answer:

33

Step-by-step explanation:

an=3+4(n)

a3=3+4(3)

a3=3+12

a3=15

a1=3+4(1)

a1=3+4

a1=7

sn=n/2(a+l)

sn=3/2(7+15)

sn=3/2(22)

sn=3×11

sn=33

Answer 2

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