To determine which items would definitely fit inside a right rectangular container with a volume of 150 cm³, we can analyze each option:
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150 cm of rope - This is a length measurement and does not correspond to volume. Thus, it doesn't fit.
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150 cm³ of water - This is the exact volume of the container (150 cm³). Therefore, it would certainly fit.
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An item that is 150.99 cm³ - This volume exceeds the container's capacity (150 cm³), so it would not fit.
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150 cm² of paper - This is an area measurement and does not correspond to volume, so it does not fit.
The only option that definitely fits inside the container is:
150 cm³ of water.