If you are able to use decimals, there are many possibilities, but I am only listing one since there are infinite possibilities. Some examples are:
-11+12
-10+13
-9+14
-8+15
-7+16
-6+17
-5+18
-4+19
-3+20
-2+21
-1+22
-0+23
And many more!
23 is prime, so no multiplying is possible besides 23*1.
I really hope this helps!
9 & 23
118
23
How about: 17+23 = 40 as one example
You can't add any two even numbers to get 23.You can't subtract any two even numbers to get 23.You can't multiply any two even numbers to get 23.About the only thing you can do is divide, like 46 divided by 2, or 92 divided by 4, etc.There are an infinite number of those that work.
-397
9 & 23
There are no two real numbers that do, but two complex numbers do: (3.5 + i 3.5 √23) and (3.5 - i 3.5 √23) If you want them to add to 7 and multiply to -294, then the two real numbers -14 and 21 work. Or if you want them to add to -7 and multiply to -294, then the two real numbers 14 and -21 work. To add to -7 and multiply to 294, the following two complex numbers work: (-3.5 + i 3.5 √23) and (-3.5 - i 3.5 √23)
83
23
73
There aren't any whole numbers that satisfy these conditions. The only numbers that multiply to 23 are 23 and 1.
23 and 19 are both prime numbers and they add up to 42.
53
118
23
-27