It has to be true because
        
             
        
        
        
These | | simple mean absolute value. Absolute value is simply the number positive, for example, the absolute value of -3 is simply 3
        
                    
             
        
        
        
Answer:
a. 
b. $225
Step-by-step explanation:
Let Mr. Scruggs got money for his birthday be 'a'
He spent  of it on dog treats = a ×
 of it on dog treats = a × 
                                                                       = 
remainder amount would be = a - 
                                                 = 
Then he divided the remainder money equally among 3 favorite charities.

= 
a. Each charity receive  
 
b. If he donated $60 to each charity.


a = $225
Mr. Scruggs received $225 for his birthday.
 
        
             
        
        
        
Answer:
m = 10 
Step-by-step explanation:
Find 'n' first..... then pythag theorem for 'm'....
n is to 5    as  15 is to n 
n/5   = 15/n 
n^2 = 75     n = sqrt (75) 
Then   m^2 =  n^2 + 5^2 
             m^2 = 75  +  25       s-o-o-o-o:     m = 10 
 
        
             
        
        
        
2x+4=3x+1 they've substituted y =2x+4 into the second eq.