I have done the work so far, and have gotten these answers.
a)
$k=5$
b)
$a_0= 20$
$a_1= -6.6667 $
$a_2= 4$
$a_3= -2.85714285714 $
$a_4= 2.2222$
c)
$3.339$
d)
$0.190$
All my answers seem correct except for d)
Can someone explain how I can get this answer.I was also wondering how do you know how many terms to look for? Or is it usually asked?