Answer:
<u>The correct answer is the letter C. </u>
Step-by-step explanation:
We can use the following trigonometric identity:
 (1)
 (1)
 (2)
 (2)
Solving each equation by b and equaling we have:


Let's recall that:
 
 
 
 
 
Then we have: 

 
 
 
 
 
 
Using equation (1) we can find b.
 
  
 
      
Finally, we can find a using the next equation:

 
 
 
 
<u>Therefore, the correct answer is the letter C. </u>
I hope it helps you!
 
        
             
        
        
        
Answer:
please give me brainliest
Step-by-step explanation:
0=2x-4
-2x=4
x=-2
 
        
                    
             
        
        
        
Answer:
79 minutes
Step-by-step explanation:
A plane is travelling at 180 meters per seconds
Convert to km/hr
180× 18/5
= 648 km/hr
Since 648 km equals 1 hour then the number of minutes required for the plane to travel 800 km is
= 1/648 × 800
= 1 hour 19 minutes
Conver the time to full minutes
60 minutes = 1 hour
= 60+19
= 79 minutes
Hence the minutes required for the plane to travel 800km is 79 minutes
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Original price of the music box = $80
Price after 20% discount = Original price - discount
                                          = 80 - 20% of 80
                                          = 80 - 
                                          = 80 - 16
                                          = $64
Price after 40% discount = 80 - 40% of $80
                                          = 80 - 32
                                          = $48
Original price of A faux Ming vase = $60
Price after 20% discount = Original price - discount
                                          = 60 - 20% of $60
                                          = 60 - 12                                    
                                          = $48
Price after 40% discount = Original price - discount
                                          = 60 - 40% of 60
                                          = 60 - 24
                                          = $36
 
        
             
        
        
        
First,we have to find the depreciation, which is 750000-75000=675000. Dividing that by 3 (for 3 years), we get 225000 dollars per year