1. number of children
 3. a 0.45
    b 40
    c y=40+0.45x
    d 70.6
 4. b 
 5. c
 6. continuous
 7. e
 8. c
 9. d
10. b
11. a 0
    b 0.121
12. a 98 pounds, 178 pounds
    b 78 pounds
13. F
14. d
15. 13 23 28 39 71