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Ella budgets $146 for yoga training. She buys a yoga mat for $10 and pays $9 per yoga class. Which inequality represents the number of classes, c, that Ella can take and stay within her budget?
a. 146 less than or equal to 9c + 10
b. 146 greater than or equal to 9c + 10
c. 146 less than or equal to 10c + 9
d. 146 greater than or equal to 10c + 9