4. Find the sum of the first eighteen terms of the arithmetic sequence whose nth term is an = 15 + 8n.
a. 1438
b. 1638
c. 1836
d. 1783

The sum of first eighteen terms of the arithmetic sequence is

Option B is correct option.

Step-by-step explanation:

We need to find the sum of the first eighteen terms of the arithmetic sequence whose nth  term is an = 15 + 8n

The formula used to calculate sum of arithmetic sequence is:

Finding a₁ by putting n=1

We have

Finding 18th term n=18

So, the sum of first eighteen terms of the arithmetic sequence is:

So, the sum of first eighteen terms of the arithmetic sequence is

Option B is correct option.

the correct answer to your question is a. 4^4

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the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844