Answer:
B) 146 ≥ 9c+10
Explanation:
$9 per yoga class can be represented with 9c, and then we have 9c+10 to represent the additional $10 yoga mat bought.
Since she can't use more than $146, then we have the inequality 9c+10≤146, which is the same as 146≥9c+10, so option B is correct.