19.) Least to greatest:
Luxembourg
Singapore
Australia
Egypt
Brazil
Answer:
Explanation below.
Step-by-step explanation:
1. a. 
b. 
c. x=144
2. a. 
b. x= 14
3.

4.

9r=3r+6
Subtract 3r from both sides
6r=6
Divide both sides by 6
r=1
3/5 of 1/6 is written as
3/5 x 1/6
Multiply both the numerator and denominators together:
3x1 / 5*6 = 3/30, reduces to 1/10.
The answer is 1/10.
I've attached the graphs to this answer. I hope they help.