Functions Math Help?!?

[Forwardium]

Hello, I need help on these questions please... Just a hint would be fine too...thank you!!

Particularly, I don't get what it means by "Recursion formula"? I couldn't find any reference to it... (example is question #2)

1. Find the next two numbers in each sequence.

A) -1, 1 , 3 , 7 , 15 , ______ , _______

B) 3, 1, 2 , -1 , 3 , -4 , ______, _______

C) 16, 24, 36 , 54 , 81, ______, ______
2. Find a recursion formula for the sequences listed above.

A) ____________, tn = _______________,

B) _______ ________, tn = _______________,

C) ____________, tn = _______________,
3.

Determine t3 , t4 , and t5 for the recursion formula listed below.

A) t1 = 1, t2= 3 , tn =2 tn-1 - 3tn-2 .

B) t1 = 4, t2= 3 , t3= 2 , tn =( tn-3 + tn-2)x tn-1

4. Create a spreadsheet file and graph for the sequence in 3. A)