Question

If you spend at least $50 (including shipping) at an online store, you receive a $10 gift card. You want to purchase CDs that cost $12 each. If shipping costs $5, write and solve an inequality to find the number of CDs you must buy to receive the gift card.

Answer 1

since you need at least fifty dollars, we know that the amount you buy is greater than or equal to fifty

amt you buy≥50

in other words:

number of CDs plus shipping cost≥50

now, let's call CDs x. if you pay 12 dollars per cd, then we can call the price for a 12x

12x+shipping≥50

shipping is $5, so

12x+5≥50