The value of the expression 5x – 2y + (7x – y)  when x = 7 and y = -2 is 90
<h3>How to evaluate the expression?</h3>
The expression is given as:
5x – 2y + (7x – y) 
Substitute x = 7 and y = –2 in the above expression
5 * 7 - 2 * -2 + (7 * 7 + 2) 
Evaluate the expression
90
Hence, the value of the expression 5x – 2y + (7x – y)  when x = 7 and y = -2 is 90
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Given problem; 
   A  = 4 π R² 
   To solve for R, we have to make it the subject of the expression. 
Since 
       A  = 4 π R² , follow these steps to find R; 
     Multiply both sides by  
  
  A x  =
  =   x 4 π R²
 x 4 π R² 
            = R²
   = R² 
  Then find the square root of both sides
         √R²  =  
   
             R  = 
 The solution is 
 
        
             
        
        
        
Answer:
3/4 x 12/1 because if you can decorate 3/4 a cupcake per minute, you multiply 3/4 by 12 to find the total amount of cupcakes he could decorate. 3/4 x 12/1 = 9 Paul can decorate 9 cupcakes in 12 minutes.
Step-by-step explanation:
hope tis helps im not good at match but i know this
 
        
                    
             
        
        
        
25-4x=16-4x
25-4x+4x=16-4x+4x
25=16
No solution 
Contradiction
        
                    
             
        
        
        
2/3-> 4/6
1/2-> 3/6
Subtract 
1/6
2/5-> 16/40
1/8-> 5/40
Subtract 
11/40