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The expression "1 + 1" is a digit representing the value "one" followed by an addition symbol, commonly referred to as "plus", followed by another digit representing the value "one."

ALL WRONG! Some people are on the right track however. WHAT IS 1+1 I SAID!
Havin' some fun in my bedroom all day and all through the night....
It is a mathematical equation.

Second answer: True
1+1 could also be a string made up of the characters '1', '+', and '1', no?
0b00110001 0b00101011 0b00110001 in ASCII, I believe. Perhaps we would also need to include the null character to terminate the string, but I am not sure if he is asking for this.
If we evaluated it and got the character 2, it would then be 0b00110010, while if we evaluated it to the integer 2 it would be represented as 0b00000010.

What is 1+1.
The answer is what.
What is 1+1? WHAT is 1+1. 1+1 is WHAT.
If that was the answer, wouldn't it have been worded "What is 1+1. ?" Without the period, it is a question and not a statement of fact.

what is 1+1?
A sentence that is a direct question.
Is your reponse a No or a Yes?
I don't want my answer to get buried

1+1=0
x = y
Then x2 = xy
Subtract the same thing from both sides:
x2 - y2 = xy - y2
Dividing by (x-y), obtain x + y = y
Since x = y, we see that 2 y = y
Thus 2 = 1, since we started with y nonzero
Subtracting 1 from both sides,
1 = 0

1+1=0
x = y
Then x2 = xy
Subtract the same thing from both sides:
x2 - y2 = xy - y2
Dividing by (x-y), obtain x + y = y
Since x = y, we see that 2 y = y
Thus 2 = 1, since we started with y nonzero
Subtracting 1 from both sides,
1 = 0
That means nothing to me.
My eyes glazed over on the second line
A statement.