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MATH / An infinite geometric series has common ratio −1/2 and sum 45. What is the first term of the series?

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problem

An infinite geometric series has common ratio −1/2-1/2 and sum 45. What is the first term of the series?
Plain-text mathematical notation (without MathML)
An infinite geometric series has common ratio −1/2 and sum 45.  What is the first term of the series?
Original LaTeX notation
An infinite geometric series has common ratio $-1/2$ and sum 45.  What is the first term of the series?

level

Level 5

type

Algebra

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