The first term of an arithmetic sequence is -8 and the common difference is 3.
The last term of the sequence is 100. How many terms are there in the sequence?
I have been trying to apply a formula that i will post a picture of but its not working, would like some help showing me what to do please!

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the formula I tried:
\[S _{n}= \frac{ 1 }{ 2 }n \left[ 2a +(n-1)d \right]\]

Here was me trying it

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