Hi again I helped you on your last question, I love helping people. Anyway here's the answer! 
16. 0.188 rounded nearest hundredth = 0.19
17.  0.455 rounded nearest hundredth = 0.46
18. 0.538 rounded nearest hundredth = 0.54
19. 0.417 rounded nearest hundredth = 0.42
20. 2.833 rounded nearest hundredth = 2.83
21. 3.667 rounded nearest hundredth = 3.67
 
        
             
        
        
        
Answer:
c=18
Step-by-step explanation:
54 divided by 9 is 6
6 times 3 is 18
 
        
             
        
        
        
1yard=0.9144m
multily both sides by 4.6
4.6yards=4.20624m
4.2meters about
        
             
        
        
        
Answer: 11.4 m
Step-by-step explanation:
The scenario depicted is that of a right angled triangle with the 7 meters being the base and the 9 meters being the height. 
The length of the ladder will therefore be the Hypothenuse. 
Using the Pythagorean Rule:
a² + b² = c² 
with c being the hypothenuse
7² + 9² = c²
49 + 81 = c²
c²= 130
c = √130
c = 11.4 m