- 8 + 17 = 9
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9
you need to add +9 +9-7 = +2
To find what you need to add to -7 to get 9, you can set up the equation: -7 + x = 9. Solving for x gives you x = 9 + 7, which simplifies to x = 16. Therefore, you need to add 16 to -7 to get 9.
-9 + 11 = 2
1-9
You need to add 17. x+-9=8 Add nine to each side x+-9=8 +9 +9 -9+9=0 so nine cancels out. 8+9=17 so now you have: x=17 Now you have the value of x.
9
You need to add 6 - (-9) = 6 + 9 = 15.
you need to add +9 +9-7 = +2
You need to add 18 to negative 8 to get 10.
you need to add 10
17
9
-9 + 11 = 2
10 - (-9) = 19
It is: -9+16 = 7
10 and 8