Because infinity is unreachable. It is imaginary. No one get ever get to infinity in any real ideal aspect. There are operations in calculus that you have to find the limit. This is imaginary and goes to infinity when in actuallity you only need to go to the 109 or 1010 to find you answer.
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If an operation calls for multiplication we multiply; if it calls for any other operation, we perform the other operation!
Parentheses in an equation tell you that you must perform that operation before any other operations, regardless of what operation that may be.
20 and 50 don't need an estimate. You can perform any operation on them just they way they are.
Infinity is any number greater than a number that already exists Infinity is any number greater than a number that already exists
Because zero multiplied by any number is always zero, but anything multiplied by infinity is infinity. Zero times infinity is being pulled both ways. Also, the definition of infinity is any number x divided by 0. When you multiply zero by infinity, the zeroes "cancel out", leaving absolutely nothing behind.