The requirement is that every element in the domain must be connected to one - and one only - element in the codomain.
A classic visualization consists of two sets, filled with dots. Each dot in the domain must be the start of an arrow, pointing to a dot in the codomain.
So, the two things can't can't happen is that you don't have any arrow starting from a point in the domain, i.e. the function is not defined for that element, or that multiple arrows start from the same points.
But as long as an arrow start from each element in the domain, you have a function. It may happen that two different arrow point to the same element in the codomain - that's ok, the relation is still a function, but it's not injective; or it can happen that some points in the codomain aren't pointed by any arrow - you still have a function, except it's not surjective.
Answer:
0.13
Step-by-step explanation:
24/100 like NewTube
30/100 like Friendspace
14/100 like NaviChat
12/100 like other
20/100 like none
100 - 20 = 80
Therefore, exactly 80% of the grandparents have a favourite social media website. The first statement is most likely to be correct
The answer is: "infinite line(s)" .
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Answer: 35
Step-by-step-explanation:
There are 20 numbers. So, it would be 7 divided by 20. Which is 0.35. And 0.35 multiply by 100 is 35.
