1.
Simplify 5
a
(4
a
2
– 2
a
) + 3
a
(-2
a
2
+ 4
a
).
A.
10
a
3
+ 4
a
2
B.
14
a
2
+ 2
a
C.
2
a
2
+ 10
a
D.
14
a
3
+ 2
a
2
Hint
2.
Multiply 4
x
2
(–
x
2
– 3
x
+ 2).
A.
–4
x
2
– 12
x
+ 8
B.
–4
x
4
– 7
x
3
+ 8
x
2
C.
–4
x
4
– 12
x
3
+ 8
x
2
D.
–4
x
2
– 7
x
+ 8
Hint
3.
A worker has a cafeteria meal plan. The plan requires her to pay $20 for the card, and $1 each time
x
she uses it. If the company sells 100 cards, what is its total revenue?
A.
2100
B.
2000 + 100
x
C.
2000
D.
100
x
Hint
4.
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.
5 uses
B.
It will never happen.
C.
20 uses
D.
10 uses
Hint
5.
Solve
x
(
x
– 2) + 2
x
(
x
+ 3) + 10 = 3
x
(
x
– 1) + 31.
A.
x
= 2
B.
x
= –2
C.
x
= 4
D.
x
= 3
Hint