Write the sum using summation notation, assuming the suggested pattern continues. -4 + 5 + 14 + 23 + ... + 131

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Write the sum using summation notation, assuming the suggested pattern continues. -4 + 5 + 14 + 23 + ... + 131

Mathematics
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what it is the common difference that is what are the following: 5-(-4)=? 14-5=? 23-14=?
right and we know a arithmetic sequence is of the form: \[a_n=a_1+d(n-1) \\ \text{ where } a_1 \text{ is first term } \\ \text{ and } d \text{ is common difference } \\ \text{ your answer will be of the form } \sum_{i=1}^{n} a_i=\sum_{i=1}^n [a_1+d(i-1)]\] so the only thing left to figure out is the n for which you get the last term 131

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for what n is a_n =131 well just solve: \[131=a_1+d(n-1)\] where you found d to be 9
wait so what do i do next? @freckles
did you find n yet?
for when an is 131
because that is basically the last step besides to plug into the final form
No I didn't find it
ok well do you still need any help?
I'm not sure if that means you are having a problem solving the equation I gave you or not

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