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find the first six terms of the sequence.
a1 = -3, an = 2 times an-1

the answer choices are:
a. -6, -12, -24, -48, -96, -192
b. -3, -6, -12, -24, -48, -96
c. 0, 2, -6, -4, -2, 0
d. -3, -6, -4, -2, 0, 2

This is a geometric sequence because each term is 2 times the previous term, called the common ratio, or "r" and it always has the form:

a(n)=ar^(n-1), a=initial term, r=common ratio, n=term number, and in this case:

a(n)=-3(2^(n-1)) so the first six terms are:

-3,-6,-12,-24,-48,-96

221,500 is the answer