Savannah buys a 40 dollars gift card to her favorite smoothie shop. Each smoothie costs 4 dollars She wants to have at least 10 dollars left on her card at the end of this month. The given inequality relates x , the number of smoothies she could buy between now and the end of this month with her gift card balance. 40 minus 4 x is greater than or equal to 10 Which best describes the number of smoothies Savannah can buy?
Answer
A
She can buy from 0 to 8 smoothies, but no more.
B
She can buy from 0 to 3 smoothies, but no more.
C
She can buy from 0 to 7 smoothies, but no more.
D
She can buy from 0 to 10 smoothies, but no more.
Explanation
Start with the inequality 40 − 4x ≥ 10. Subtract 10 from 40 to get 4x ≤ 30, so x ≤ 7.5. Since Savannah can buy only a whole number of smoothies, she can buy at most 7. However, choice A says up to 8, so none of the choices correctly describes the result.
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