What property of the gas helium makes it useful in balloons?

Helium has many unique properties: low boiling point, low density, low solubility, high thermal conductivity and inertness, so it is use for any application which can exploit these properties. Helium was the first gas used for filling balloons and dirigibles.

Helium is not used to make balloons, Its used to make them float. The answer is because it's such a dense gas.

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multiplying and dividing the two decimals and the eqations by the same number of the overalls

it's not c. i took the quiz and got it wrong. so my best guess is b.

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