Final answer:
To simplify the expression 25y - 4 + 7 - 9(10y), use the order of operations and combine like terms to get -75y + 3.
Step-by-step explanation:
To simplify the expression 25y - 4 + 7 - 9(10y), we can follow the order of operations (PEMDAS). First, we simplify within parentheses by multiplying 9 and 10y, which gives us 90y. Then, we combine like terms by adding 7 and -4, which gives us 3. Finally, we combine the remaining terms to get 25y + 3 - 90y.
Combining the y terms, we have 25y - 90y = -65y and the expression becomes -65y + 3. Therefore, the correct simplified expression is option d) -75y + 3.