Answer:
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
8/16 = 27/x
8x = 432
x = 54
 
        
                    
             
        
        
        
If they get unexpected results they could note what they could've done wrong or what they could change in a next trail of experiments. Or look back and see what different happened to they could've hypothesized. There could be many different courses on what to do next.
 
        
             
        
        
        
Answer:
The cost of 1kg jam is $7 and the cost of 1kg butter is $4
Step-by-step explanation:
Let jam = x
 butter = y
 3x + 2y = 29 -----(1)
 6x + 3y = 54 -----(2)
(1)×2 -> 
 6x + 4y = 58 -----(3)
(3)-(2) -> 
 y = 4
suby=4into(2)
 6x + 3(4) = 54
 6x = 42
 x = 7
(Correct me if i am wrong)
 
        
             
        
        
        
Answer:
   no. see below
Step-by-step explanation:
This much of Josh's working is correct:
   x^2-6x=7 
   x^2-6x+9=7+9
   (x-3)^2=16
At this point Josh apparently overlooked the fact that he needed to take the square root of both sides of the equation. Had he done that, he would have ...
   x -3 = ±4
   x = 3+4 . . . or . . . 3 -4
   x = 7 or -1
_____
Josh reported values of x that would match ...
   x -3 = ±16
He <em>violated the equal sign</em> by taking the square root on the left, and multiplying by ±1 on the right. Doing different operations on the two sides of the equation will mean the value of x is changed to something other than what you're looking for.