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.

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