Charles runs a catering service for large parties. He needs 37 heads of lettuce for salad to feed 100 guests. Which of the following proportions could he use to determine the number of heads of lettuce, x, he would need for 275 guests?

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