1.
What is the value of the determinant?
A.
-12
B.
12
C.
-3
D.
-8
Hint
2.
Use Cramer's rule to solve the system of equations.
A.
(0.4, 0.2)
B.
(0.2, 0.4)
C.
(0.011, 0.0055)
D.
(-0.4, -0.2)
Hint
3.
Find the value of the determinant of
A.
6
B.
2
C.
64
D.
–32
Hint
4.
Solve the system –2
x
– 4
y
= 7, 3
x
+ 5
y
= 9.
A.
(71, –39)
B.
C.
D.
Hint
5.
Vince and Brian each need two kinds of items at the store. Vince bought 10 of item A and 14 of item B, and spent $97. Brian bought 8 of item A and 25 of item B, and spent $119. How much did each item cost?
A.
item A = $2.10
item B = $1.14
B.
item A = $3
item B = $5.50
C.
item A = $1.14
item B = $2.10
D.
item A = $5.50
item B = $3
Hint