Problem 11) Start with set U = {1,2,3,4,5} and cross off 1,2,3 to be left with A' = {4,5}. We basically erase everything found in set A. You have the correct answer. Nice job.
Problem 12) Start with U = {1,2,3,4,5} and erase '5' to be left with {1,2,3,4}. So B' = {1,2,3,4}. You are correct here as well.
I can't help with the other problems since either letters, numbers or symbols are missing. Please make a new post and provide those updates.
Answer:
e=9
sorry thats all i know:(
Step-by-step explanation:
Answer:
The value of x nearest to thousandths is, 74.207
Step-by-step explanation:
Solve : 
represents the logarithmic function with base e.
Using logarithmic properties:
, then 

Apply the logarithmic properties; we have

then;

or

Divide both sides by 2 we get;

Therefore, the value of x nearest to thousandths is, 74.207
Answer:
300
Step-by-step explanation:
X^2=10×10=100
3×100=300