12 Σ n=3 (-5n -1) can someone help me solve? a) -410 b)-385 c) 385 d) 410

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12 Σ n=3 (-5n -1) can someone help me solve? a) -410 b)-385 c) 385 d) 410

Mathematics
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i have a calculator that gives me the answer...but lets work it out ok\[\sum_{n=3}^{12}(-5x-1)\]
I have solved others like it but i think the -x through me
error that shd be n" not x so -5n-1

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Okay, i was told to rewrite -5n-1 starting at 3 until i get to 12
ok i dont really know how to explain this ...look here it have all the steps https://www.symbolab.com/solver/trigonometric-equation-calculator/%5Csum_%7Bn%3D3%7D%5E%7B12%7D%5Cleft(-5n-1%5Cright)%20/?origin=enterkey
Thank you for your help, i got the correct answer :)

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