3. 8, 8*2+1, 8*3+2, 8*n+n-1
or An=9n-1
I have 3 questions I'm stuck on and would love for someone to explain and show me how to solve them so I can also solve the other one.
Find the partial sum S6
1. An=3n+2
2. Find the number of terms n in an arithmetic sequence if a1=20, d=5, and An=75.
3. Find the general term for 8,17,26,35,44......
4 answers
3. x + 9
#2
Term(n) = a+(n-1)d
75 = 20 + (n-1)(5)
55 = 5(n-1)
11 = n-1
n = 12
there are 12 terms
Term(n) = a+(n-1)d
75 = 20 + (n-1)(5)
55 = 5(n-1)
11 = n-1
n = 12
there are 12 terms
Thanks for the help bobpursley and Reiny I appreciate showing how you got to it so I can also do it.