Answer:
1/49
<em>Step by step explanation:</em>
 
        
                    
             
        
        
        
profit=f(x)
so solve for f(x)=1000
1000=70n-400
add 400 to both sides
1400=70n
divide both sides by 70
20=n
20 students need to be enrolled to make a profit of 1000.00
 
        
             
        
        
        
Answer:
y=1/2x+2
Step-by-step explanation:
The equations come in the form of y=mx+c, where m is the gradient and c is the y-intercept. Looking at the graph we know that the y-intercept is (0,2), so that rules out options B and C.
To find the gradient is a little more tricky, but we can follow the formula:
 , where rise is the vertical value and run is the horizontal value
, where rise is the vertical value and run is the horizontal value
So we sub in our values:

And simplify:

So now we sub in our new found values into y=mx+c:
y=1/2x+2
 
        
                    
             
        
        
        
Answer:
40 or 39
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
I use 'n' as the unknown value, but you can use any letter you want as the variable. 
The product of four and a number would be represented by '4 * n'. The ideal way to write this would be '4n', even though '4 * n' is also correct in value. 
The square of the number would be n². Squaring a number is multiplying a number by itself. 
The phrase 'difference between...' means subtraction. 
Putting it together:
"The difference between the product of 4 and a number and the square of the number" would be:

Hope this helps.