Write a recursive formula for the following arithmetic sequence.
-6, -11, -16, -21,

tn = a+(n-1)-5

Explanation:
The common formula for arithmetic sequences is
tn = a+(n-1)d
or
tn = a+(n-1)xd
tn = term
a = the first value (used when finding the xth term)
n = number of terms
d = common difference

The sequence has a common difference of -5 and if you are trying to create a recursive formula the a, n term are used to apply to any digit.
:)

He will need 2,898 pieces of paper