What is the 20th term of the sequence that begins-3, 6, -12, 24
-524,288
524,288
1,572,864
3,145,728

Now, on these sequence... alrite, -3, then 6, then -12

now... the term's sign is alternating, minus, plus, minus and so on

the next term, is twice as much, but with a different sign

thus, the "multiplier" or "common ratio" is -2 then

-3 * -2 = 6
6 * -2 = -12
-12 * -2= 24 and so on

now, what's the 20th term?

well,

 

r   = 2.65m

good luck!

cutie~

If you make you answer for clear i can answer it : )