Answer:
Step-by-step explanation:
#1:

division sign means that we flip the fraction

now we can multiply all the constants together and all variables

now we can combine all the parts

#2:




20 - (4xn) = 4 is the equation
Your to you problem is 1.05 times 10^-14
I would love to help but I am not quite sure what the question is. Could you please include the last part if there is one?