3. Which of the following is the inverse of the relation {(1, 5), (2, 6), (1, 7), (4, 8)}?
A. {(1, 5), (2, 6), (7, 1), (8, 4)}
B. {(5, 1), (6, 2), (7, 1), (8, 4)}
C. {(2, 6), (1, 5), (8, 4), (7, 1)}
D. {(1, 7), (1, 5), (2, 6), (8, 4)}

4. Find f ◦ g if f(x) = x + 7 and g(x) = 3x – 2.
A. 3x + 5
B. 3x – 5
C. 3x + 19
D. -3x – 19

Question

3.   Which of the following is the inverse of the relation {(1, 5), (2, 6), (1, 7), (4, 8)}? 
A.   {(1, 5), (2, 6), (7, 1), (8, 4)} 
B.   {(5, 1), (6, 2), (7, 1), (8, 4)} 
C.   {(2, 6), (1, 5), (8, 4), (7, 1)} 
D.   {(1, 7), (1, 5), (2, 6), (8, 4)} 

4. Find f ◦ g if f(x) = x + 7 and g(x) = 3x – 2.
A. 3x + 5
B. 3x – 5
C. 3x + 19
D. -3x – 19

blurbendy · Answer

for #4, evaluate f(x), when g(x) is place in for x in f(x)

f(g(x) = 3x - 2 + 7
= 3x -5

anonymous · Answer

for 3, the inverses domain=functions range so co-ordinates are switched..so your answer would be B