In the Lisa and Sarah context, let's let x represent the distance Lisa has walked toward Sarah (in feet), and let d represent the distance between Lisa and Sarah (in feet). Untried This question is relative to the Lisa and Sarah context. Use the variables from the text above this question. Write an expression (in terms of x ) to represent the total distance that both Lisa and Sarah have walked. Write an expression (in terms of x ) to represent the distance between Lisa and Sarah as they walk toward one another. Write a formula that expresses d in terms of x . At some moment, Lisa has walked 19 feet toward Sarah. At this moment, what are the values of x and d ? x = d =