1.
Determine which matrix has a determinant.
A.
B.
C.
[1 -4 -8]
D.
Hint
2.
Find the determinant of
A.
-16
B.
0
C.
-11
D.
-21
Hint
3.
Find the value of the determinant of
A.
2
B.
6
C.
–32
D.
64
Hint
4.
Solve the system –2
x
– 4
y
= 7, 3
x
+ 5
y
= 9.
A.
B.
(71, –39)
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 = $3
item B = $5.50
B.
item A = $2.10
item B = $1.14
C.
item A = $1.14
item B = $2.10
D.
item A = $5.50
item B = $3
Hint