Find the next three terms in each sequence.Then, write the rule for finding the nth terms.
ex:2/3,3/4,4/5,5/6,6/7,7/8
rule:(n+1)
___
(n+2)
1. 1,4,7,10,__,__,__
rule:_________
2. 6,11,16,21,__,__,__
rule:_________
3. 3,5,7,9,__,__,__
rule:_________
4. 1,4,9,__,__,__
rule:_________
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