Answer
a decrease of 0.2 gallons per second
Explanation
The drain was open for 30 seconds.
The water that ran out for 30 seconds = 20 - 14
 = 6 gallons
Rate of decrease = (change in gallons)/(time taken)
 = 6/30
 = 0.2
The rate of change in the amount of water remaining in the tub per second will be the same as the one that ran out since the outlet is the same. 
So the correct answer from the choices is "a decrease of 0.2 gallons per second".
 
        
             
        
        
        
Answer:
<h3>            
  9, 11, 13, 15</h3>
Step-by-step explanation:
{k - some integer}
2k+1  - the first odd integer (the least)
5(2k+1)  - five times the least
5(2k+1)+3 -<u> three more than five times the least</u>
2k+1+2 = 2k+3  - the odd integer consecutive to 2k+1
2k+3+2 = 2k+5   - the next odd consecutive integer (third)
2k+5+2 = 2k+7   - the last odd consecutive integer (fourth)
2k+1+2k+3+2k+5+2k+7  - <u>the sum of four odd consecutive integers</u>
2k+1 + 2k+3 + 2k+5 + 2k+7 = 5(2k+1) + 3
 8k + 16 = 10k + 5 + 3
      - 10k       -10k
-2k + 16 = 8
      -16       - 16     
       -2k = -8  
     ÷(-2)    ÷(-2)  
       k = 4
2k+1 = 2•4+1 = 9
2k+3 = 2•4+3 = 11
2k+5 = 2•4+5 = 13
2k+7 = 2•4+7 = 15   
Check: 9+11+13+15 = 48;  48-3 = 45;  45:5 = 9 = 2k+1
 
        
             
        
        
        
#10
 
#11
- Last three i.e Option B,C,D
#13
It started from negative ends at positive hence 
 
#14
 
 
#15
 
#16
 
 
 
 
        
             
        
        
        
Answer:
(Picture)
Step-by-step explanation:
To find 60% of people you just multiply .6 with the number you are trying to find 60% of. Like 100. 100 times .6 = 60.