1.
Simplify (7
a
4
b
) (8
a
7
b
6
).
A.
15
a
28
b
6
B.
15
a
11
b
7
C.
56
a
28
b
6
D.
56
a
11
b
7
Hint
2.
Simplify (3
a
4
b
5
c
)
4
.
A.
12
a
8
b
9
c
5
B.
7
a
16
b
20
c
4
C.
3
a
16
b
20
c
4
D.
81
a
16
b
20
c
4
Hint
3.
Evaluate (3.2 × 10
-5
)(5.4 × 10
9
). Express the result in scientific notation.
A.
17.28 × 10
4
B.
1.728 × 10
5
C.
1.728 × 10
3
D.
0.1728 × 10
6
Hint
4.
Evaluate
. Express the result in scientific notation.
A.
8.0 × 10
-7
B.
0.8 × 10
-8
C.
8.0 × 10
-9
D.
80 × 10
-8
Hint
5.
Tell whether the statement is
sometimes true, always true
, or
never true
for positive values of
n
. If it is sometimes true, state for what value it is true.
4
n
= 6,561.
A.
never true
B.
always true
C.
sometimes true,
n
= 7
D.
sometimes true,
n
= 8
Hint