The product of a number and 8 less than the number is -15. Find the number.

9

Step-by-step explanation:

In order to find this answer you need to determine what it is really saying

It took me a few times to read this but i determined what you need to do is :

count down from every number (-1 to -9) until you can come up with -15.

At this point you can determine the answer is 9

Hope this helps

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b. 153 students do not participate in sports and seventy-five 12th graders were surveyed