-169 is the answer if plugged directly into a calculator.
π is irrational
Solve to get one of the variables of the equation alone on one side of the = sign. Then plug in its value to the other equation. For more ways, see This.
No. Infinity is not a number but an entity, which never ends. It has no value, and so infinity cannot be divided.
Zero is not a number. A number is a value or the symbol representing a value. Zero has no value.
Zero is not a number, but an independent entity. It is an anti-number, and it is nothingness, so it can not be positive or negative.
π=pi=3.1415....=pi=π
The calculator works very well for me. If you have an issue please consider investing in a handheld calculator. Complaining about free resources which are amazing will get you nowhere in life.
Here is a wonderful site which will thouroughly answer that question if you take the time to read it thoroughly.
Math Is Fun
1/2→3/6
2/3→4/6
3/6
+ 4/6
--------
7/6 or 1 1/6
+817 
