SOLUTION: I need to find the partial sum of 1+5+9+...+109 I understand how to find partial sum. I just haven't been able to figure out the common difference between the numbers. So far

Question 744798: I need to find the partial sum of 1+5+9+...+109
I understand how to find partial sum. I just haven't been able to figure out the common difference between the numbers.
So far, I have the equation set up as 109=1+(n-1)d
I just need to find d.
Could you explain to me how to find this answer?
Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!

I need to find the partial sum of 1+5+9+...+109
I understand how to find partial sum. I just haven't been able to figure out the common difference between the numbers.
So far, I have the equation set up as 109=1+(n-1)d
I just need to find d.
Could you explain to me how to find this answer?

d or common difference is 4. Isn't 5 - 1 = 4?

Doesn't 9 - 5 = 4?
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