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The first term of an arithmetic sequence is -3 and the fifteenth term is 53. What is the common difference of the sequence? 4
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The first term of an arithmetic sequence is -3 and the fifteenth term is 53. What is the common difference of the sequence?

4

User Iamblichus
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The answer is 4. So d=4.. a=-3 and a+14d=53 where a is -3 so substitute a into the second eqn so -3+14d=53 then find for d so...14d=56 so d=4
User Piotr Kukielka
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