Step-by-step explanation: You multiply 12 times 12 because we have to find how many items are in a 12 dozen first which is 144 because there are 12 items in one dozen. We already know that there are 144 items in 12 dozens and there are 12 dozens in a gross, which is 144 items in total. Now we have to multiply 144 times 12 to find how many items are in a great gross. 144 times 12 is 1728.
After h hours A has 6000 - 2000h cells and B has 2000 - 1000h. Equating them as one form: 6000 - 2000h = 2000 - 1000h -2000h + 1000h = 2000 - 6000 -1000h = -4000 h = -4000/-1000 = 4 hours
