When a cartridge fails to fire you should keep the gun pointed in a safe direction and wait seconds before carefully unloading the firearm.?

I believe the answer is: 10 seconds

When a cartridge fail to fire, the bullet would definitely stucked inside the gun, but the bullet could be completely unmoved or just slowed down. Because of this,you need to face the gun on safe direction in order to ensure that no bullet would come up when you try to open the cartridge.

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.