No. There were lots of life forms with feet long before humans came along.
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The person who invented the plus sign is the same as the minus
Add your inches together first. 5 plus 9 equals 14. There are 12 inches in a foot so 14 inches is the same as 1 foot 2 inches. Now add 6 feet plus 3 feet plus 1 foot and you get 10 feet. Add the 2 inches and you have 10 feet 2 inches. 10ft 2in
Start by getting all of the terms in the same form, for example, convert all of the measurements to feet, 15 feet - 2 feet + 2 feet = 15 feet.
Yes
Linear feet are the same as feet so the answer is 12 feet.