Question

how do you write an equation for terms in a series?
( ex: 216, 212, 208, 204... )

Answer 1

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Answer 2

for a series you need to know the equation Sn = (n(a1 +an))/2 for the sum
If you want to find a number, you need an =a1 + (n-1)d where d is difference and an is the number in the series you want

Answer 3

This is all for an arithmetic series, i assume the rate in this is -4