To determine which items would definitely fit inside a right rectangular container with a volume of 150 cm³, let's analyze the options provided:
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150 cm³ of water - This would fit inside the container exactly, as it occupies the same volume as the container.
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150 cm of rope - This is a linear measurement, not a volume measurement. The volume occupied by the rope would depend on its thickness or diameter, so this cannot be definitively stated to fit based on the container's volume.
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An item that is 150.99 cm³ - Since this item has a volume greater than the container's volume of 150 cm³, it would not fit inside.
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150 cm² of paper - This is an area measurement, not a volume measurement. Whether it would fit inside the container or not cannot be determined based on volume alone.
Based on this analysis, the only option that definitely fits inside the container is:
150 cm³ of water.