What is the 20th term of the sequence -3, 6, -12, 24
the answer is 1,572,864 i just need to know the math in order to obtain the answer.
will give brainliest

-1,572,864

Step-by-step explanation:

notice that each new term is found by multiplying the previous term by -2.  Thus, the common ratio is -2.  The first term is -3.

The general formula for a geom. sequence is a(n) = a(1) · r^(n-1), where r is the common ratio and a(1) is the first term.

In this problem,

a(20) = -3 · (-2)^(20 - 1), or

         = -3 · (-2)^19, or

         = -3 · 524288, or

          = -1,572,864  (Note:  this is negative)

the answer is the third / last answer

step-by-step explanation: