posted by Marissa on .
I'm pretty sure these are right but I just want to check.
1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7
2)Write an equation for the nth term of the arithmetic sequence -3,3,9,15...
3)Find the two arithmetic means between 4 and 22
4)Simplify:Find Snfor the arithmetic series in which a1=3,d=1/2,and an=15
5)I don't know how to type this but its like this in my book.
Find; 8 is on top of the sigma notation and k=3 is at the bottom(40-3k) is on the right side