

1. 
Which is the graph of f(x) = x  4 and its inverse? 


A. 

B. 



C. 

D. 



Hint 


2. 
A family has a monthly net pay N which is 70% of their gross monthly pay G. They decided to subtract their monthly food allowance of $350 from their monthly net pay and invest 5% of the remainder. Write an equation for the investment each month I, given the above restrictions. 


A. 
I = 0.95(0.3G  350) 
B. 
I = 0.95(0.7G  350) 


C. 
I = 0.05(0.3G  350) 
D. 
I = 0.05(0.7G  350) 


Hint 


3. 
Given the function f(x) = , find the inverse. 


A. 
f ^{1}(x) = 4 
B. 
f ^{1}(x) = 


C. 
f ^{1}(x) = x  4 
D. 
f ^{1}(x) = 1 


Hint 


4. 
Given the function f(x) = , is the inverse a function? How do you know? 


A. 
No, this function passes the horizontal line test. 
B. 
Yes, this function fails the horizontal line test. 


C. 
Yes, this function passes the vertical line test. 
D. 
No, this function fails the horizontal line test. 


Hint 


5. 
Given the function f(x) = x^{2}  8x + 16, is the inverse a function? How do you know? 


A. 
Yes, fails the horizontal line test. 
B. 
No, fails the vertical line test. 


C. 
No, fails the horizontal line test. 
D. 
Yes, passes the vertical line test. 


Hint 

