Please help!! It’s just one simple question ( don’t AWNSER it if u don’t know it bc it’s for a test) <3

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

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss