The first term is and 5th term is
.
(Apply nth term of an arithmetic sequence formula: )
(Substitute
)
(Substitute 16 for
)
(Subtract:
)
(Add 4 to each side)
(Apply commutative property of addition:
)
(Apply additive inverse property:
)
(Apply additive identity property:
)
(Add:
)
(Divide each side by 4)
(Cancel common terms)
(Divide:
)
First term is and common difference is d = 5.
(Apply nth term of an arithmetic sequence formula: )
(Substitute
and 5 for d)
(Apply distributive property:
)
(Apply commutative property of addition:
)
(Subtract:
)
The nth term of the arithmetic sequence formula is .