Even if you don’t think it is an independent variable, is usually always plotted on the “x” axis. Help?

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

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?