1.
Find –8
x
3
y
2
(3
xy
4
– 2
x
5
–
y
).
A.
–24
x
4
y
6
- 16
x
8
y
2
+ 8
x
3
y
3
B.
–24
x
4
y
6
+ 16
x
8
y
2
+ 8
x
3
y
3
C.
–5
x
4
y
6
- 10
x
8
y
2
- 9
x
3
y
3
D.
–24
x
4
y
6
+ 16
x
15
y
2
+ 8
x
3
y
3
Hint
2.
Simplify 5
a
(4
a
2
– 2
a
) + 3
a
(-2
a
2
+ 4
a
).
A.
14
a
3
+ 2
a
2
B.
14
a
2
+ 2
a
C.
2
a
2
+ 10
a
D.
10
a
3
+ 4
a
2
Hint
3.
Solve 4
a
(
a
– 4) – 7
a
=
a
(4
a
– 3) + 20.
A.
a
= -2
B.
a
= -1
C.
D.
a
= -6
Hint
4.
Multiply 4
x
2
(–
x
2
– 3
x
+ 2).
A.
–4
x
4
– 7
x
3
+ 8
x
2
B.
–4
x
2
– 7
x
+ 8
C.
–4
x
4
– 12
x
3
+ 8
x
2
D.
–4
x
2
– 12
x
+ 8
Hint
5.
A cafeteria has two meal plans. One requires the worker to pay $20 for the card, and $1 each time
x
she uses it. The other plan requires the worker to pay $30 for the card, but only $0.50 each time
x
she uses it. After how many uses will the workers with different plans have spent the same amount of money?
A.
10 uses
B.
20 uses
C.
5 uses
D.
It will never happen.
Hint