Answer:
30 % off 
Step-by-step explanation:
12 dollars off of 40 
40 (x) = 12 
x = 12/40 = .3     or  30 %
 
        
             
        
        
        
Answer:
5 8/15 I rly hope this helps man
 
        
             
        
        
        
Answer:

Step-by-step explanation:
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We can figure out how long Michael's trip took by realizing that 30 mph is 3 times 10 mph.  Because of this, the trip home will take 1/3 the amount of time it took to go up the hill.  This makes the equation 24 + 8 = 32 minutes for the whole trip.
Now we need to figure out how long the trip was.  We can do this by multiplying 10 minutes by 24/60, which equals 4.  This means that Michael went 4 miles there, and 4 miles back.  So Michael went a total of 8 miles.
Now we know that Michael went 8 miles in 32 minutes.  Now, we multiply 8 by 60/32.  This gives us 15, so Michael went 15 miles per hour on average in the trip.