It depends where you buy it and what exact style of sheet. There are at least 12 different sheets in stores like Home Depot, and hundreds in drywall wholesale stores. A basic 4x8 1/2 inch is about $11 in my area.
average price to tape and mud is anywhere from .50 to1.00
An average sheet, 4x8 x 1/2 is around $9.
Square footage estimates on drywall are based on the square footage of wall and ceiling that need to be covered.
White drywall is just normal everyday drywall.
A drywall dimpler is a drill bit used to countersink a drywall screw to the proper depth without breaking the drywall paper.
Drywall has absolutely NO granite in it.
Drywall is VERY porous .
No, you cannot get cut by drywall
All questions like this depend on the market you are in and where you are geographically. You haven't told us either one
Yes, drywall is a light reflector.
No, pumice has nothing to do with drywall.
You prime it with drywall primer.