Q: Do graphs have to start at the number zero?

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No.

have no zero point

zero is not a counting number. if you count the number of kids in a room, would you start with the number 0?

No.

Zero is an even number, but to say even numbers start with zero does not take into account even negative numbers. Zero is an even number on an infinite list of even numbers that has no beginning and no end.

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no but bar graphs do have to start at zero

No.

line graphs show a change over time

A bar graph's data doesn't always start with zero but the scale on the y axis should. If you are not going to start the scale with zero then you have to put a squiggly line at the bottom to show that you skipped this space.

No. And for examples where they don't look at graphs where the x-axis is years. If the scales do not start at zero, this fact should be clearly indicated.

have no zero point

No...zero is not a natural number, natural numbers start at the number 1.

zero is not a counting number. if you count the number of kids in a room, would you start with the number 0?

No.

Zero is an even number, but to say even numbers start with zero does not take into account even negative numbers. Zero is an even number on an infinite list of even numbers that has no beginning and no end.

Zero divided by any number is zero. If you start out with two numbers that aren't zero, then the result of a division is never zero.

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