Question

9, 13, 17, 21, 25,...

What is the common difference?
What is the value of the first term?
Write a simplified expression for the right half of the equation that can
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be used to find the n term in the sequence.
an

Answer 1

4

Explanation:

The difference between the number is clearly four. I'm assuming the first term is 9, but if not, it would be 1 ( 9 - ( 4 * 2 )) = 1 where 1 > 0. The equation can be simplified as 9 ( the first number ) + 4 ( the common difference ) * n-1 ( as the first number is 9, not 13 ) for n>1 ( since if n = 1, then what is n = 0? )
hope this helped!