A plumber uses the expression 48 + 25h to determine the number of dollars to charge each customer. If h = 4, how much does the customer pay?

Substitute 4 for h in the expression: 48 + 25(4). First, 25 × 4 = 100, and then 48 + 100 = 148. The customer pays 148 dollars, which is choice D.

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