<span>f(x)=6x^3-3
1.  Replace f(x) with y:  y = 6x^3 - 3   
2.  Interchange x and y:  x = 6y^3 - 3       x+3                                      x+3
3.  Solve this result for y:    y^3 =           ---------   or y = cube root of  -------
                                 -1                                6                                          6
4.  Replace y with  f     (x)
</span>
        
             
        
        
        
D) 5 is the answer 
Assuming AE and CE are the same length you would set the two equations to each other: 8x+7=11x-8
Then solve for x:
Subtract 8x from both sides and add 8 to both sides looking like: 15=3x
Divide by 3 to get x by itself and you get x =5
        
                    
             
        
        
        
CATERING TOTAL COST  F(X) = 10X + 300
TOTAL REQUIRED                       14X
                                                  10X + 300 = 14X
                                                   10X - 14X = -300
                                                            -4X = -300
                                                              4X = 300
                                                                X= 300/4
                                                                 X=75  <------------------SOLUTION
 
        
                    
             
        
        
        
Follow these steps to convert fraction to a mixed number
 First Multiply the whole number part by the fraction's denominator.
 Then add it to the numerator.
Then write the results on top of the denominator.
07/13 = 10713 = 8 3/13
The answer that I got is
8 3/13 
I hope it helps