Martin has a combination of 33 quarters and dimes worth a total of $6. Which system of linear equations can be used to find the number of quarters, q, and the number of dimes, d, Martin has?

The total number of coins gives q + d = 33. Each quarter is worth $0.25 and each dime is worth $0.10, so their combined value is 0.25q + 0.1d = 6. Therefore, choice D gives the system that matches both the number of coins and their total value.

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