We can find a and b using inverse trig functions,


Hope this helps.
Answer:32,768
2*4=8*4=32*4=128
So we have to multiply by 4
128*4=512 5th term
512*4=2048 6th term
2048*4=8192 7th term
8192*4=32768 last term
You would divide 24 by 5 so the length would end up being: 4.8 in
Hope it helps!