Luisa realized that to purchase 3 tacos it costs $3.75 and to purchase 5 tacos it costs $6.25. how much does it cost for each taco?

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