Answer:
$900
Step-by-step explanation:
a)Off given on purchasing a TV=  20%
 20% on TV = $ 180
Let the original price of TV set $ x
According to question,
20% of x= $180
 ×x= $180
 ×x= $180
x = $ 180× 5
x= $ 900
Hence, Original price of TV set= $ 900
b)  By second method,
20%= $180
1%= $ 9
100% = $900
Hence, the original price $ 900
 
        
             
        
        
        
Answer:

Step-by-step explanation:

 
        
             
        
        
        
a triangle adds to 180 degrees
we have 90 and 40 so the hypotenuse is 50 degrees
        
                    
             
        
        
        
Answer:
The UPC is not valid..
Step-by-step explanation:
The Universal Price Code is represented in the form of bars which is scanned when we purchase something.
The last digit of the UPC is the check digit.
Give UPC = 375407370090 
To check whether the UPC is valid or not. 
Step 1: 
Add the digits at odd positions. 
3 + 5 + 0 +3 + 0 + 9 = 20
Step 2: 
Multiply the number obtained in step 1 by 3
20*3 = 60 
Step 3:
The digits at even positions have to be added. The last digit has to be ignored as it is a check digit.
7 + 4 + 7 +7 +0 = 25
Step 4:
Add the numbers obtained in Step 2 and step 3
60 + 25 = 85
Step 5:
The number obtained in step 5 is subtracted from the next multiple of 10. 
In the above case, 
85 will be subtracted from 90.
90 - 85 = 5 
For a valid UPC, the answer to step 5 is equal to the last digit of UPC.
In the above case, the answer is 5 which is not equal to zero. 
So, the UPC is not Valid.
 
        
             
        
        
        
I'm not sure but i think that it is because you can actually do it