# What is the 21st term of an arithmetic sequence with terms #a_6=50# and #a_11=85#?

##### 1 Answer

Mar 13, 2017

#### Explanation:

If

As

and as

we have

or

and

#=15+20xx7=15+140=155#

Mar 13, 2017

If

As

and as

we have

or

and

#=15+20xx7=15+140=155#