Answer: Charlotte's 15 and Edgar's 7 
Step-by-step explanation:
7*2=14 
14+1 = 15 
15 + 7 = 22
 
        
             
        
        
        
Answer:
5x+3
Step-by-step explanation:

consider marking as Brainliest if this helped
 
        
             
        
        
        
Answer:
6 dollars 
Step-by-step explanation:
40-10=30
30/5= 6
 
        
                    
             
        
        
        
The school bought 16 calculators. 
504/31.50 =16
        
             
        
        
        
8x - 9x²y + 7y² - 2x⁴
-2x⁴ - 9x²y + 8x + 7y²