So this one makes 0 sense, but it ask for you to: Express as a sum: 15-7

The answer is:   " 15 + (-7) " .

Step-by-step explanation:

Here is what to do:

Given: " 15 – 7 " ;  Express this as a "sum" :

 Note:  This given expression is:
      " 15 minus 7 "
   that is:  " 15 – (+7) ;

 Note that subtracting a "positive" value;

  such as in the very expression given;

           is the same value we get when:

      adding that particular "negative" value;

→  As such:  " 15 – 7 " =

           " 15 + (-7) "  → which is our answer.

Hope this is helpful to you!

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step-by-step explanation: