What expression ? There isn’t one
Answer:
Parallel segments → 1
perpendicular segments → 2
congruent segments → 3

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Five Hundred is in word form to put it in standard notation, we just write he number like so 500.
Answer: no
Step-by-step explanation:
because you can do what is known as the vertical line test to determine if it is a function you do that by plotting it and if it goes in a vertical line then it is a function