Question 25541
Using the formula for the nth term of an arithmetic sequence, what is 101st term? Answer:	201
Show work in this space.	

fn = 2n - 1
f101 = 2*101-1 = 201

Using the formula for the sum of an arithmetic series, what is the sum of the first 20 terms? 
Answer:	400
Show work in this space		

a20 = 2n – 1 = 2*20-1=39

	Sn = n/2(a1 + an)
	Sn = n/2(a1 + a20)
	S20 = 20/2(1 + 39)
	S20 = 10(40)
	S20 = 400

Using the formula for the sum of an arithmetic series, what is the sum of the first 30 terms? 
Answer:	900	
Show work in this space	

a30 = 2n – 1 = 2*30-1=59

	Sn = n/2(a1 + an)
	Sn = n/2(a1 + a30)
	S30 = 30/2(1 + 59)
	S30 = 15(60)
	S30 = 900