The answer depends on the units used for 6.51 - which are not specified in the question. For example, 6.51 cents, rounded to the nearest dollar is 0.
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$7.01 to the nearest dollar is $7.00
To the nearest ten cents it will round up to give 67.20 as your answer. It would round down to 67 for the nearest dollar.
$4.12 rounded to the nearest dollar is $4.00
4534 to the nearest thousand is 5000 3.28 to the nearest dollar is 3.00
$24.00