Answer:
The multiplication (15(3 - y)) should be done before the addition (12 + 15(3 - y)). To fix this error, we can add parentheses to specify the correct order of operations: 12 + (15(3 - y)) - 10y.
Explanation:
The correct order of operations is as follows:
Parentheses: Expressions within parentheses should be evaluated first.
Exponents: Exponents should be calculated next.
Multiplication and division: These operations should be performed from left to right, working from left to right.
Addition and subtraction: These operations should be performed from left to right, working from left to right.