Answer: probably D
In math difference means subtraction
Step-by-step explanation:
To be honest there are lots of different reasons. You might want to try and talk to him to let him now how he is making you feel.
Copper: Nickel = 4:1
a) How much copper needed for 20 kg nickel
C:N = 4: 1
C:20 = 4:1
C/20 = 4/1 Cross Multiply
C*1 = 4*20
C = 80
80kg Copper would be needed.
b) How much Nickel would be needed for 20 kg of Copper
C:N = 4: 1
20:N = 4:1
20/N = 4/1 Cross Multiply
4*N = 1*20
4N = 20 Divide both sides by N.
N = 20/4 = 5
5kg Nickel would be needed.
Answer:
20480
Step-by-step explanation:
4hr = 12 doubles
5 * 2 ^ 12 = 20480
