1. 3.5 from the book

a. print "The rabbit is " + str(x) + "."
b. print "The rabbit is " + str(x) + " years old."
c. print str(y) + " is average"
d. print str(y) + " * " + str(x)
e. print str(y) + " * " + str(x) + " is " + str(x*y)

2. When the program encounters a return statement, it exits the function and returns that value.  It does not make sense to have code after a return statement since that code will never get executed.