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Answered

Find the 15th term of the arithmetic sequence 17,13,9...

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Charlespanguego

Answer:

[tex]a_{15} = -39[/tex]

Step-by-step explanation:

Let n=15; a1=17; and d= -4

[tex]a_{n} = a_{1} + (n-1)d\\a_{15} = 17 + (15-1)-4\\a_{15} = 17 + (14)-4\\a_{15} = 17 + (-56)\\a_{15} = 17 - 56\\a_{15} = -39[/tex]

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