What is 1% of $80 equal

Well, OF is kind of the same with multiplication. So that question is indirectly saying 1%x$80. As you know, percent means over 100. So that will be;

1/100x$80

1/100 is 0.01. So that means 0.01x$80. And that is 0.8. So the answer is 0.8. Hope I helped.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

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