Let the distance be x miles 
Time = Distance / speed 
Time taken by Mike to go to his friend's house = x / 40 hours 
Time taken by him to return = x / 45 hours 
Total time = x / 40 + x / 45 = 4 hours 
= 9x + 8x = 1440 miles 
17x = 1440
= x = 1440 ÷ 7
= x = 84.706
Time taken to return home = 84.706 /45= 1.882 hours .
Therefore , Mike took 1.882 hours to reach home .
 
        
             
        
        
        
Answer:
use photomath and if that dont work use m a t h w a y
Step-by-step explanation:
 
        
             
        
        
        
Answer:
   A.  50.24
Step-by-step explanation:
Put the value where the variable is and do the arithmetic.
   f(4) = 3.14(4²) = 3.14×16 = 50.24
 
        
             
        
        
        
Answer:
400 cards
Step-by-step explanation:      %
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<u><em>Calculate</em></u>
<u><em /></u>
<u><em>Multiply both the numerator and denominator with the same integer</em></u>
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<u><em>Cross out the common factor</em></u>
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<em>I hope this helps you</em>
<em>:)</em>