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?

Respuesta :

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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