The formula to find a certain number in an arithmetic sequence is an=a1+d(n−1)an=a1+d(n−1) . solve for n

Step-by-step explanation:

Given : The formula to find a certain number in an arithmetic sequence is

, where is the nth term , is the first term and d is the common difference.

To solve the formula for n , first subtract from both sides , we get

Now, divide d on both sides , we get

Now, add 1 to the both sides , we get

Or

your answer is a

step-by-step explanation:

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it should be a and d. lmk if i'm wrong xd