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| PAGE: 667 | SET: Exercises | PROBLEM: 23 |
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 
.
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