Final answer:
The expression that cannot be used to find Renato's total earnings is any that does not involve multiplying the hourly rate by the number of hours worked, such as dividing or subtracting.
Step-by-step explanation:
To find Renato's total earnings in dollars for working 10 hours at a rate of $14 per hour, we would typically use the expression 10 hours * $14 per hour. This equals $140, which represents Renato's earnings before taxes or any other deductions. However, to identify an expression that cannot be used to find her total earnings, we look for an expression that does not multiply the number of hours worked by the hourly wage or any operation that doesn't equate to her total earnings. Any expression, such as dividing hours by rate or subtracting the rate from the hours, does not calculate total earnings correctly. Therefore, the expression (10 hours / $14 per hour) or (10 hours - $14 per hour), for instance, cannot be used to find her total earnings.