a.

Write an expression for total cost of the lunch: .

  (Distributive property: )

                                                  (Add: )

                                                 (Multiply)

Therefore, the amount spent for lunch is .

b.

Amount in Billies hand is .

Amount spent for lunch is .

Left over amount is .

Cost of a cold sandwich is .

Number of sandwiches Billie can be purchased.

                                                      (Divide: )

So, Billie can buy cold sandwiches with the amount left over.

c.

Both weeks are monday through friday, Billie have to pack her lunch times.

a. Amount spent for lunch is .

b. Billie can buy cold sandwiches with the amount left over.

c. Monday through friday billie have to pack her lunch consider times.