For Commutative Property of Addition
Let us take a decimal number  and a fraction
 and a fraction 
Now, according to the Commutative property of Addition:
For any two numbers  and
 and  :
 :

So, for  and
 and 
Let us add 

                                    
Also, 

                                      
Therefore, 
Hence,  Commutative Property of Addition is satisfied.
For Associated Property of Addition
Let us take two same decimal numbers  ,
 ,  and a fraction
 and a fraction 
Now, according to the Associated property of Addition:
For any three numbers  ,
,  and
  and  

So, for  ,
 ,  and
 and 
The Left hand side:


                                                          
                                                          
                                                         
                                                          
                                                         
The Right hand side:


                                                 
                                                 
                                                 
                                                 
Thus, 

Therefore, 
Hence,  Associative Property of Addition is satisfied.
 
        
             
        
        
        
Answer:
x=8
y=16
Step-by-step explanation:
2x+2y=48
3x+y=40
Ther is many ways to solve this, one of them is clearance:
WE CLEAR AN UNLOCKED (X) AND REPLACE IT IN THE OTHER
x= (40-y)/3
2[(40-y)/3] +2y=48
(80-2y)/3 +2y=48
(80-2y+6y)/3=48
80+4y=48(3)
4y=144
y= 144/4
y=16
x=(40-y)/3
x=(40-16)/3
x=24/3
x=8
 
        
             
        
        
        
We are given 
The equation that models this trip is T= 36x + 60
T represents the total cost for the group to take the trip and 
X equals the number of people going
we know that 
Domain is all possible values of x for which any function is defined
Since, number of people can neither be negative nor in decimals 
so, x can not be negative or in decimals 
now, we will check each options
option-A:
x=40
This is positive and whole number
so, this can be domain 
so, this is TRUE
option-B:
x=60
This is positive and whole number
so, this can be domain 
so, this is TRUE
option-C:
0< x< 40
It also includes decimals numbers
and we know that 
x can not be in  decimals
so, this is FALSE
option-D:
0< x< 39
It also includes decimals numbers
and we know that 
x can not be in  decimals
so, this is FALSE
 
        
                    
             
        
        
        
Answer:
take 16.03 and subtract 2.9
16.03-2.9=13.13
so maria used 13.13 gallons
Step-by-step explanation: