1.
Solve
A.
B.
C.
10
D.
7
Hint
2.
Solve
A.
1, 4
B.
-1, 4
C.
-1
D.
0
Hint
3.
Solve
A.
4
B.
-4
C.
-3, 4
D.
-4. 3
Hint
4.
Suppose that Pam could build a house in
months and Jerry could build a house in
months. If they work together, how long would it take them to build the house?
A.
months
B.
months
C.
10 months
D.
5 months
Hint
5.
Solve
.
A.
7
B.
–
C.
0 and 7
D.
–
and 7
Hint
months and Jerry could build a house in 
months. If they work together, how long would it take them to build the house?