Math, asked by jamesmaryabraham, 5 months ago

12. The sum of first n terms of an arithmetic sequence is 3n2 + 4n
a) What is its first term ?
b) Write the algebraic form of the sequence.
c) Find the 20th term.

Answers

Answered by MDALTAFALAM

1

Answer:

a) 7

Step-by-step explanation:

c) a20=s20-s19

=1280-1237

=43

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