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.