Cassie should use gallons to eliminate the need to write the value in scientific notation.
What is the volume?
Volume represents the space that a substance or 3D shape occupies or contains.
Units of volume are cubic meter, litre, gallon etc.
Since teaspoons, cubic inches etc are smaller units of the volume so we need to represent the volume of the fish tank in scientific notation.
Gallon is the bigger unit of the volume so we do not need to write the value in scientific notation.
Hence, Cassie should use gallons to eliminate the need to write the value in scientific notation.
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