The answer is -8 because -2 * 4
        
                    
             
        
        
        
Answer:
A 20
Step-by-step explanation:
Given 
Phone Battery Life (hours)
A 20
B 25
C 10
D 18
8.45% of the battery life of each mobile phone is used in a day by a typical user
Calculating Hours of battery life in a day for each mobile
A 20
Battery life for A =  hours
hours
B 25
Battery life for B =  hours
hours
C 10
Battery life for C =  hours
hours
D 18
Battery life for D =  hours
hours
Therefor Mobile phone A 20  uses a total of 1.69 hours of battery life in a day
 
        
             
        
        
        
The answer to your question is C
        
             
        
        
        
Answer:
20-
Step-by-step explanation:
3 parts=30 cards thus 2 parts: 20