1.
Solve
for
x
by the method of determinants.
A.
11
B.
C.
D.
Hint
2.
Solve
for
n
by the method of determinants.
A.
B.
C.
D.
Hint
3.
Solve
by the method of determinants.
A.
(-0.2, -0.4)
B.
(0.4, 0.2)
C.
(-0.4, -0.2)
D.
(-0.2, 0.4)
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
= $5.50
item
B
= $3
B.
item
A
= $5
item
B
= $3.50
C.
item
A
= $750
item
B
= $3.50
D.
item
A
= $4.50
item
B
= $3
Hint
5.
Which method of finding solutions would work best to find the solutions to the system
and state why?
A.
adding and multiplying
B.
adding or subtracting
C.
substitution
D.
determinants and matrices, because there are fewer calculations
Hint