Answer:
the answer is 2
Step-by-step explanation:
 
        
             
        
        
        
21 + 15 = 36
36 x 3 = 108
Their father donated $108 to charity
 
        
                    
             
        
        
        
We know that
An ordered pair is used to locate a point on a coordinate grid.
The first number in an ordered pair is the 
x-coordinate, and the second number in an ordered pair is the 
y-coordinate.
In this problem, the ordered pair is

so
the x-coordinate is equal to 

the y-coordinate is equal to 

therefore
Rule N 1The y-value is 

 times the x-value
Rule N 2The y-value is 

 greater than the x-value     
Both are possible because their solutions include the ordered pair listed          
 
        
        
        
Finding the difference between the two temperatures, it is found that Regina is 38.7ºC degrees colder in January than in July.
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- The mid-afternoon temperature in January is of -12.6ºC.
- In July, it is of 26.1ºC.
- The difference of the temperatures is given by:

From the difference of 38.7ºC, there are two interpretations:
- Regina is 38.7ºC degrees colder in January than in July.
- Regina is 38.7ºC degrees warmer in July than in January.
A similar problem is given at brainly.com/question/22136310