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Mathematics 5 Online
OpenStudy (anonymous):

What is the sum of a 30–term arithmetic sequence where the first term is 71 and the last term is –103? a –384 b –448 c –480 d –416

OpenStudy (cwrw238):

formula is (n/2)[a + l] where a = first term n = number terms and l = last term

OpenStudy (cwrw238):

= 15(71 + -103)

OpenStudy (cwrw238):

= 15 * -32

OpenStudy (anonymous):

So, C Thanks!

OpenStudy (cwrw238):

yep yw

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