Question

find the sum of the first ten terms of for each arthmetic sequence.
A3=5 A4=8​

Answer 1

Answer:

the sum of the first ten terms is 130.

check the attachment for the complete answer...

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Answer 2

Step-by-step explanation:

here, firstly find d ( common difference)

d = 8 - 5 = 3

A3 = a + 2(3)

A3 = 5

5 = a + 6 , a = -1

A 4 = 8

Sn = n/2 (2a + (n-1) d )

= 10/2 ( -4 + 9 x 8 )

= 340