First, determine the area of a football field. Remember that the end zones are part of the area. Second, determine the area of a stamp. Third, make sure your units are the same. You will have to convert from square yards to square inches or from square inches to square yards. Last, divide the area of the football field by the area of the stamp. The result is the number of stamps required to cover the field.
The area of any rectangle is the product of its length and width: A = l x w. There are 144 square inches per square foot, and nine square feet per square yard.
4
8.47992684×1013
806.66 Cubic Yards
324
12" x 12" = 1 square foot. 400 of them are required in order to cover 400 square feet.
Yes
Sure, as long as it equals to the proper amount of postage in the end.
Yes.
In the US postage stamps are always valid. You do still have to have enough to cover the current postage cost. And Forever stamps are always valid for one ounce of first class mail, regardless of the actual cost.
no, because for each letter, you can only use 1 stamp. Yes, you certainly can in Canada, and most other countries. Postage paid is postage paid, regardless of the stamp denomination. Assuming, of course, that the stamp total is sufficient to cover the required postage.
Yes, postage stamps require that you pay for them. That is how the postal service gets its revenue so that it can do business. Postage goes up when the cost to deliver exceeds the cost taken in.
Priority Mail flat rate envelopes cost US$5.75 in postage. With standard 49 cent stamps, it would take 12 stamps to cover the postage.
No, that is not valid for postage. It was just easier to print them that way. Make sure you use a real postage stamp on your letters.
Enough to cover the postage of the letter; one usually does the job. US domestic stamps may not be valid for postage outside the US; check with your local post office, or the Postal Service home page, for information on foreign postage.
Yes. Postage does not have to paid through individual stamps; as long as the value of all stamps placed on the envelope is enough to cover the cost that envelope carries, any number and value of stamps can be used.
Yes, but that would be foolish. Buy some one-cent stamps to make up the 42 cent postage and save those 41 cent stamps.
It will depend on size and weight. Normally it means a second stamp is needed to cover the weight. That would be 17 cents for a second ounce. There are also premiums for over sized envelopes.