Answer:B
Step-by-step explanation:
 
        
             
        
        
        
Answer:
The answer to your question is below
Step-by-step explanation:
pH definition
                          pH = - log [H⁺]
a) For pH = 2.4, solution A
                        2.4 = -log[H⁺]
                       [H⁺] = antilog⁻².⁴
                       [H⁺] = 0.00398
   For pH = 9.4, solution B
                        [H⁺] = antilog⁻⁹.⁴
                        [H⁺] = 3.98 x 10⁻¹⁰
b) Divide hydrogen-ion concentration of solution A by hydrogen-ion concentration of solution B.
                              0.00398 / 3.98 x 10⁻¹⁰
                              10000000 times
c) By 7, because 7 is the number of zeros
 
        
             
        
        
        
Answer: The actual distance is 6 km
Step-by-step explanation: If you do a conversion from 1 cm to 20 km in fraction form, you will have

So, if you solve for km, you will get 6 using cross multipulcation
 
        
             
        
        
        
The answer is 88 cube units.