Answer:
B. A water wheel in a dry river
Step-by-step explanation:
Work is said to be done when a force moves a body or an object through a certain distance in the direction of the force. Thus for work to be done, force and distance are required.
i.e Work done = Force x distance
It is measured in Joules.
Also, the work done by an object could be a measured of potential energy.
So that,
Work done = potential energy = mass x gravitational force x height
Considering the collage in the question, since the water wheel is in a dry river no work is done. Water wheel is a device that functions through the flow of water body, thus causing its rotation.
 
        
             
        
        
        
5(z-4)-z=4z-20
5z-20-z=4z-20
4z=4z
z=z
The answer is C
        
             
        
        
        
Answer:
12x^6y
Step-by-step explanation:
 
        
             
        
        
        
31=2y-5
Add 5 on both -5+5 which cancels out and 31+5 which is 36 and then divide 36 by 2 which equals to 18.
So y=18 hope this helped (':
 
        
                    
             
        
        
        
Answer:
T=4B+10C
Step-by-step explanation:
for every bag there are 4 doughnuts
for every carton there are 10 doughnuts