geekynerd90 geekynerd90

19-10-2018
Physics

contestada

10 points and brainliest for proper answer!!!

The third term of an arithmetic sequence is 15, and the seventh term is 23. What is the first term?

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osprey2015 osprey2015

02-11-2018

15 = a+(3-1)d

23 = a+(7-1)d

simultaneous eqs. solve for a and d

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