Six friends order lunch write an expression that shows the total cost if each person orders one sandwich and one cookie

Total cost is represented by expression 6x + 6y where x is cost of one sandwich and y is cost of one cookie.

Step-by-step explanation:

lets say cost of one sandwich = x

And cost of one cookie = y

given that each person order one sandwich and one cookie.

so cost of lunch of one person = 1 * cost of one sandwich + 1 * cost of one cookie

⇒cost of lunch of one person = 1*x + 1*y = x + y

six friends are there, so cost of lunch of six person = 6*cost of lunch of one person = 6 * (x + y) = 6x + 6y

hence total cost is represented by expression 6x + 6y where x is cost of one sandwich and y is cost of one cookie.