It depends upon what you actually mean by your question. In base 6 we could not write 13 + 13 = 26. There is no number 26 in base 6!
However we could still represent the same thing, but the representation of the numbers would look different.
In base 6: 13 (in base 10) would be 21 and 26 (in base 10) would be 42.
So, the actual amounts would be the same, but in base 6 we would write this as:
21 + 21 = 42.
There cannot be such a formula because it is incorrect. The fact that there is the digit 9 in the sum is an indication that the base is at least 10. And in a base that is 10 (or greater) the above sum does not work. UNLESS the word "plus" has a non-conventional meaning.
The answer is 23. Simply add the numbers together as you would 2+2 to get the answer. You can use a calculator to check your work.
The answer is 338. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
The answer is 67.6. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
The answer is 106. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
The answer is 89937. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
The answer is 614. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
The answer is 214.5. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
If: A = Y+B Then: -Y = -A+B or Y = A-B
The answer is 0. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
The answer is 2340. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
The answer is 3050. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.