Curtis bought 4 dvds that each cost the same amount. he had a $10-off coupon and spent $46 in all. what was the cost of each dvd before the coupon was applied?

:malik received a $300 gift card from his grandparents and is using it only to pay for his karate lessons, which cost $30 per month. determine what amount, in dollars, remains on the card after 8 months.