Sequences and Series, I am struggling and could use some guidance.

I could really use some help with sequences and series. I don't understand how the equations are suppose to work. I seem to be struggling with the problems.

State the first five terms of the sequence if a1=4 and an+1=-3an

Find the 65th term of the sequence 9, 15, 21, 27,.....

Find the sum of each infinate geometric series.

-15+5+5/3+... _________

E-4(3/4)n-1 ___________

Find the Recursive and explicit (nth term) formulas for the sequence.

-3, 4, 11, 18 Recursive: ____________Explicit: ____________

Find 2 geometric means between 6 and 60.25.

________,__________

Find 3 arithmetic means between -25 and 5

________,__________,_________

Thanks in advance for the help.