You need to add 6 - (-9) = 6 + 9 = 15.
Add -3 to 9 because 9+(-3) = 6 Alternatively add s to the Roman numeral of ix which is 9 which then becomes six.
18
you need to add +9 +9-7 = +2
They add up to 9
You will add -3 to 9 to make it 6.
add 9 add 1 subtract 20 add 9 add 1
18
They also add up to a multiple of 9.
288. All multiples of 9 will have digits that add to a multiple of 9. To get a multiple of 9 to be all even, you need to get them to add to 18, since no set of even numbers will add up to 9. 288 is the lowest multiple of 9 to be able to add to 18. ■
86.
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.