Answer:
you can use math as a banker, a doctor, a scientist, the president probably uses math, you use math to see how much less juice you gave your sibling, and you can use math to help in collage! (sorry if its wrong tell me if it is)
 
        
                    
             
        
        
        
Option A looks like the best definition
        
             
        
        
        
Answer:
20 hertz of frequency produced.
Explanation:

Here we will find frequency and period should be in second, here given: 0.05 seconds
using the formula:


 
        
             
        
        
        
Nuclear power plants, wind farms, water farms, and geothermal heating