The snack bar at your school has added sushi to its menu. The ingredients for one roll includes sushi rice, seaweed sheets, cucumbers, cream cheese, and three oz of smoked salmon. One roll can be cut in the seven servings. Write an expression for the amount of salmon needed to make s servings of sushi. How much time is needed to make 14 servings?21 servings?70 servings? 100 servings? HELP PLEASE !!