Julie is buying cookie boxes at an online store. The cost of a box of chocolate chips cookies is $15.00 and a one time shipping cost of $7.00. Write an expression for the cost for Julie to buy n boxes of cookies from the online store.

Question

Julie is buying cookie boxes at an online store.  The cost of a box of chocolate chips cookies is $15.00 and a one time shipping cost of $7.00. Write an expression for the cost for Julie to buy n boxes of cookies from the online store.

mxddi3 · Answer

so each box of cookies is 15.00, along with an additional fee of 7.00. 
this 7.00 is going to be our constant , and y is going to be our cost.

so we have y=__n+7.00
this is because there is a 7 dollar fee. 
now for the n, it says each box is 15.00 and she got "n" boxes so all you have to do is put 15 before the n.

so from that, can you write the expression ?