The People of California are collecting food cans, their goal is 2,000 cans, after 10 days they've got 800 cans, what is the percent of the cans they got.

40%

Step-by-step explanation:

What I did is 800/2,000 because since there goal is 2,000 and so far they have 800. I made a fraction because I wanted to know how much cans they need more witch is 1200 but I wanted to know the percentage they have so far before they meet there goal so I did 800/2,000 witch got me 40%

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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