Answer:
-6mph
Step-by-step explanation:
45 is 3/4hour so -8 times 3/4= -24/4=-6mph
 
        
             
        
        
        
Answer:
5/(3x+2) = 7/(5x-2)
<=>5*(5x-2) = 7*(3x+2) (x is not equal to -3/2 or 2/5) 
<=> 25x -10 = 21x +14   (x is not equal to -3/2 or 2/5) 
<=> 4x = 24                   (x is not equal to -3/2 or 2/5) 
<=> x = 6 (valid)
 
        
             
        
        
        
Use FOIL
28x² -8xy +7xy -2y²
28x² -xy -2y²
        
             
        
        
        
34.5=4h+7c
(34.5-7c)/4=h
Put h= (34.5-7c)/4 into another equation 
30.5=8h+3c
30.5=2(34.5-7c)+3c
30.5=69-14c+3c
11c=38.5
c=38.5/11
Put c=38.5/11 into one of the equations
to calculate the h.
        
             
        
        
        
Solution: The sample mean of sample 1 is:

The sample mean of sample 2 is:

The sample mean of sample 3 is:

The sample mean of sample 4 is:

The minimum sample mean of the four sample means is 3.6 and maximum sample mean of the four sample means is 4.4.
Therefore, using  his four samples, between 3.6 and 4.4 will Ardem's actual population mean lie.
Hence the option 3.6 and 4.4 is correct