Answer:
a)=251.2 cm    b)=50240 cm
Step-by-step explanation:
a) The formula for calculating the circumference of a circle is c=d*pie, where D is the diameter of the circle.
Therefore, C = 2 * 40 * 3.14 = 251.2 cm
b) The distance covered by 200 revolutions of the wheel is 200 times the circumference, 200*251.2=50240 cm.So to think about this we can assume that there is a point A on the wheel, the distance that point A travels when it rotates 200 times.
 
        
             
        
        
        
40% of 40 
10% of 40 is 4
4 x 4=16
40-16 =24
Answer is 24
        
                    
             
        
        
        
It would be $18.94, because the hundredths place is the penny.
        
                    
             
        
        
        
Answer:
45
Step-by-step explanation:
1 minute = 8 revolutions 
x minutes= 360 revolutions 
Divide 360 by 8 
45
The wheel will make 360 revolutions in 45 minutes 
Check your work: 
If 45 minutes = 360 revolutions, and the wheel revolves 8 times per 1 minute, 8 revolutions x 45 minutes should equal 360 revolutions. 
(it does)