Find an equation for the nth term of the arithmetic sequence. -15, -6, 3, 12, ...

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Find an equation for the nth term of the arithmetic sequence. -15, -6, 3, 12, ...

Mathematics
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please explain how you got it
can you find the common difference of that given series? or know what common difference is?

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Other answers:

thats correct!
so just use this formula \(\Large a_n = a_1 + (n-1)d\) where d = common difference = 9 a1 = 1st term = -15 plug these values in, and tell me what u get :)
so an= -15 + 9(n-1)?
good! now simplify that. distribute 9 to (n-1)
9n-9?
oh ok i got it, Thank you!
can you help with summation though? ill open another question
yes, then we had -15 so finally, \(\large a_n = 9n-24\) welcome ^_^ and sure, open another question :)

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