Near enough as much as you like if you keep going for hours and days.
You will get 36 pieces.
A square yard can represent a square with dimensions of 3 feet by 3 feet. Therefore a 7 foot diameter gasket cannot be cut out of a square yard. If you meant 7 inches diameter, then you will be able to cut 25 gaskets from 3 feet by 3 feet but you may even be able to cut 26 gaskets if the square yard was a rectangle of 7 inches wide (by 185 inches long).
One square yard is nine square feet. Divide 2100 square feet by 9 and you get 233 and a third square yards in 2100 square feet. You would probably need more than that, as there will be some lost material as you cut in the various corners. You will need to draw this out.
The purpose of a Flail mower is to cut tougher, thicker grass that can not be cut by an ordinary mower. They are usually driven and often used to cut grass by roadsides.
Who is supplying the mower and the fuel? Who is supplying the protective equipment? Is the acre fairly level, or is it hilly; is it clear or are there obstacles to cut around? How tall is the grass? The taller the grass, the slower the job. Are you sure it's an acre? How long will it take you to cut the entire acre? If you don't know, perform some calculations based on the fact that there are 43,560 square feet in an acre. How many square feet can you cut per second? How much are other people charging to do the same thing? How much do you want to earn over what period of time?
There aren't any square feet in nine feet. Square feet are 1 foot wide by 1 foot long. Nine feet is nine feet. You don't give any width or depth for someone to calculate. If you took your nine feet and cut it into one foot lengths you would be able to make two and one fourth, one square foot boxes if that's what your question is.
94 if you don't have to cut or replace any.
Grass
Well, darling, if we're talking square footage, 16 feet by 24 feet gives you a total of 384 square feet. So, if you're looking to redecorate or throw a party, now you know how much space you've got to work with. Just make sure to measure twice and cut once, honey.
This would depend on how big the lawn mower is. If it can fit over the pineapple, it should easily be able to cut it.
Well, darling, 25 feet times 12 feet equals 300 square feet. So, if you're looking to cover that area with some fancy carpet or maybe a fresh coat of paint, you'll need 300 square feet of material. Just make sure to measure twice and cut once, honey.
I don't know if this this is a specific type of mower. To get a good Finnish ;you are better using a cylinder mower; electric of course.