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06-07-2016
Mathematics

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the first term of an arithmetic sequence is -2 and the fifteenth term is 68. what is the common difference of the sequence? 7 33/8 5

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06-07-2016

Hello,

Answer C : 5

[tex] u_{1}=-2\\ u_{2}=-2+r\\ u_{3}=-2+2r\\ u_{15}=-2+14r=68\\ [/tex]
==>14r-2=68
==>14r=70
==>r=5

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