No.
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It is the apostrophe symbol, a single character after the number as shown below. No space is required. Symbol: ' Example: 35' = 35 feet
No. $34 correct. $ 34 incorrect
If a is not less than b then a is greater than or equal to b. The symbol for "greater than or equal to " is > with a bar under it -- a combination of the equal sign (=) and the greater than sign (>). In many computer languages you can use >= with no space between for this relation.
The space between letters in printing (or typography) is called tracking.