Answer:
126.
Step-by-step explanation:
This is the number of combinations of 4 cards  from 9 cards:
= 9C4
= 9! / 4! 5!.
A quick way of calculating this is  
9*8*7*6
----------- =   9*2*7   =    126 combinations.
4*3*2*1
 
        
             
        
        
        
Answer:
3.5 Gallons Per Minute or 3.5m
Step-by-step explanation:
Since there is 10.5 Gallons in 3 minutes, do
10.5/3 = <u>3.5</u>
(please mark brainliest if this helps!)
 
        
             
        
        
        
Answer: √0.16
Step-by-step explanation:
√0.16 = 0.4
 
        
             
        
        
        
By changing the number into a decimal, and then moving the decimal twice to the right.