brazymay brazymay

22-12-2017
Mathematics

contestada

Find the 18th arithmetic sequence when a1=-4 and d=6

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dalendrk dalendrk

29-12-2017

[tex]a_n=a_1+(n-1)d\\\\a_1=-4;\ d=6\\\\substitute\\\\a_n=-4+(n-1)\cdot6=-4+6n-6=6n-10\\\\a_{18}=6\cdot18-10=108-10=98[/tex]

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