exam Maths Puzzle Numerical Ability

Indicate yes or no if the following are functions?
1. y=x^3
2. y=x^2-1
3. y=5
4. y=x^4

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exam Other Question
What would the volume be of a hot tub that is circular , 12 feet in diameter, 4 feet deep? This needs to be in cubic feet. Can someone help me with this problem?

I need to write the following number in expanded form:

684

Thank you,
Ashley