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MATH / The sum of the first 5 terms of an arithmetic series is 70. The sum of the first 10 terms of this arithmetic series is 210. What is the first term of the series?

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problem

The sum of the first 5 terms of an arithmetic series is 7070. The sum of the first 10 terms of this arithmetic series is 210210. What is the first term of the series?
Plain-text mathematical notation (without MathML)
The sum of the first 5 terms of an arithmetic series is 70.  The sum of the first 10 terms of this  arithmetic series is 210.  What is the first term of the series?
Original LaTeX notation
The sum of the first 5 terms of an arithmetic series is $70$.  The sum of the first 10 terms of this  arithmetic series is $210$.  What is the first term of the series?

level

Level 5

type

Algebra

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