1.   Find the value of .
    A. 24 B. -24
    C. 28 D. -28
    Hint

  2.   Which of the following shows the system of equations using a matrix equation?
   
    A. B.
    C. D.
    Hint

  3.   Find the inverse of .
    A. 0 B.
    C. D. does not exist
    Hint

  4.   Find the inverse of .
    A. B.
    C. D.
    Hint

  5.   Solve this problem using matrix equations.How many liters of 0.25 solution and 0.40 solution should be combined to make 10 liters of 0.35 solution?
    A. 2.5 L of the 0.25 solution and 7.5 L of the 0.40 solution.
    B. 6.66 L of the 0.25 solution and 3.33 L of the 0.40 solution.
    C. 3.33 L of the 0.25 solution and 6.66 L of the 0.40 solution.
    D. 4.5 L of the 0.25 solution and 5.5 L of the 0.40 solution.
    Hint