How do you write a rule for the nth term of the arithmetic sequence given #a_20=240, a_15=170#?
2 Answers
Jul 20, 2017
Explanation:
Hence
and
Subtracting (B) from (A),
and hence putting this in (B), we get
or
Hence
#=-26+14n-14=14n-40#
Jul 20, 2017
Explanation:
So for the
To check out answer let's calculate
Which is true.