standard height is 36 inches and if there is available wall space you should put it as close to the sink or shower/tub as possible.
80 inches
11 feet (132 inches).
288 inches = 7.3152 meters and384 inches = 9.7536 metersso, the answer is 71.34953472 square meters
2880 exactly, but if this is ceramic tiles you have to account for grout lines. extras would be recommended
10 feet by 14 feet
Either on the left or right, 26 inches off the floor and 8 to 12 inches forward from the front of the toilet bowl. Reference: http://www.ehow.com/info_8027723_proper-placement-toilet-paper-holder.html
Believe they can be placed just along side one another. By code, the height is 12 inches above floor.
36 inches max from rear wall to furthest edge of dispenser. 19 inches minimum above finished floor to center of roll.
should be on floor.
Depends on the toilet being purchased, but generally 12 inches from the wall to the center of the toilet flange for a residential toilet.
on the floor on the floor
Sure. Either way. The wax ring seals the toilet to the closet flange so it doesn't really matter that much. The important part is that the toilet be mounted firmly to the floor so that it doesn't move. That would cause the wax ring to fail then the toilet would leak around the flange.
They are usually about 24-26 inches high
That depends on who is to use the toilet. children's toilet seats (in schools for example) are much lower than in an apartment and old peoples homes have even higher seats. The Swedish standard toilet height (to the rim not including any seat) is 420 mm.
The standard placement is 20 - 24 inches from the floor up to the center of the TP holder. New toilet configuration these days my be several inches higher than the old standard toilet. If you have a newer toilet, adjust accordingly.
Unless it is a very strange arrangement, turning off the toilet on the first floor should only shut off the water to that toilet. It should have no effect on the upstairs shower.
They should stand atleast 7 inches from floor to shoulder, at limit, they should stand 15 inches from floor to shoulder