Final answer:
The integer that represents the change in Zach's score is -38.
Step-by-step explanation:
The expression -7(9) + 25 represents Zach's score. To evaluate this expression, we first perform the multiplication: -7 * 9 = -63. Then, we add 25 to this result: -63 + 25 = -38. Therefore, the integer that represents the change in Zach's score is -38.