1. a) 
= 
b) 
2. a) 
b) 
3. a) 
b) 
4. a) 
b) 
5. a) 
b) 
6. a) 
b) 
7. a) x = 10 ** Note: 2 is NOT a solution. Make sure you test all possible solutions in the original equation to make sure they work. See textbook section 6.4 example 2 and the explanation after it up through the caution on page 386.
b) 
8. a) 
b) 
9. a) 
b) 
10. 15 inches, 36 inches, and 39 inches
11. 2 mph upstream and 10 mph downstream
12. a) 0 b) 10
13. a) 
b) -1000
14. a) 