Do verical lines represent functons? explain

If i have 20$ and i gave 5$ away how much i got

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.