Isaac is making sandwiches for a group of friends. he needs 3 ounces of meat for each sandwich. part a: isaac is not sure how many sandwiches he will be able to make. write an expression with a variable that represents the amount of meat isaac needs for his sandwiches. identify what the variable represents. part b: if isaac has 18 ounces of meat, how many sandwiches can he make? create an equation and show all work to solve it.