21-07-2016
Mathematics

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If you spend at least $50 (including shipping) at an online store, you revive a $10 gift card. You want to buy CDs that cost $12.50 each. If shipping costs $5, write and solve an inequality to find the number of CDs you must buy to revive the gift card.

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22-07-2016

let the number of CDs bought be x, then the inequality is given by:
12.5x + 5 >= 50
12.5x >= 50 - 5
12.5x >= 45
x >= 45/12.5
x >= 3.6
x >= 4

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