1.
What is the value of the determinant?
A.
-8
B.
-3
C.
-12
D.
12
Hint
2.
Use Cramer's rule to find the value of
n
in the system of equations.
A.
B.
-22
C.
D.
Hint
3.
Find the value of the determinant of
A.
–32
B.
2
C.
6
D.
64
Hint
4.
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
5.
Two sides of an angle are contained in lines whose equations are 6
x
+ 4
y
= 15 and 7
x
– 9
y
= 3. Find the coordinates of the vertex of the angle. Round to the nearest hundredth.
A.
(–1.79, 1.06)
B.
(1.79, 1.06)
C.
(147, 87)
D.
(–147, –87)
Hint