Homework quick help please..no idea how to do this?

Question

it says you have $55 to buy DVDS that cost $12 each. write an expression for how much money you have left after buying n discs.

what does this mean by write an expression?

Answer 1

it doesn't have an equal sign.

55-12n (55 dollars which u have minus 12 dollars times each disc you buy)

i think this would be a way you could write one.  

Answer 2

write a formula.... to solve how much money you will have after buying a certain number of disks

you start with your whole amount or start value (55)

subtract how much you spend

if each dvd is 12 and you buy n dvds you spent 12n (because you would multiply 12 by the number of dvds you got... ex you buy 3 dvd you spend 12x3 or 36$)

Your formula or expression would be

your start value minus the 12n

55-12n=money left

understand any better?

Answer 3

Ok you would have enough money to get 4 dvds. You would have 7 dollars left over.  That's the answer.

Answer 4

You have enough money to buy 4 DVDs.  After spending $48 to buy 4 DVDs ($12 each x 4), you would have $7 left.

The "expression" is 7/12 - meaning you have $7 but you need $12 to buy the next DVD.

Hope this helps!