6. Matrices A and B are given below.

Which of the following matrices is A − B ?

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7. For what value of x is the function below undefined?

\[ f(x) =\frac{2(x+3)}{(x+3)} \]

F. −3
G. 0
H. 1
J. 2
K. 3

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8. A bag contains 8 red marbles, 5 yellow marbles, and 7 green marbles. How many additional red marbles must be added to the 20 marbles already in the bag so that the probability of randomly drawing a red marble is ​\( \frac{3}{5} \)​?

A. 5
B. 10
C. 18
D. 20
E. 24

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9. One of the following graphs in the standard (x,y) coordinate plane is the graph of the equation 3y − 2x = 6. Which graph?

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10. If an obtuse angle is bisected, the resulting angles must:

A. both be acute.
B. be complementary.
C. both be obtuse.
D. both be right.
E. be supplementary

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