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Look at the points on the graph. What is the x coordinate of each point?

1,2,3,4,5,6...etc? I really don't know, I missed this lesson :/

0 as well

I was correct?

So

I think it's A or B.

What is the difference between `real numbers` and `integers` ?

Integers are numbers that are both positive and negative

is something like 12.5 an integer ?

Yes?

no, 12.5 isn't a whole number
it has the fractional/decimal part 0.5

12 is but 12.5 is not

Negative and Positive?

integers can be either positive or negative, yes
but they are also whole numbers too

I think it's A.

is there a point with say x = 7.2 ?
7.2 is a real number between 0 and 9

No. At least I don't think so due to 7.2 is not a Whole Number.

the points given in the graph only have x coordinates that are whole numbers, ie integers

x = 3 is allowed but x = 3.7562 is not allowed. There are gaps between the different numbers