Question

Find the sum of the first 6 terms of the series. 3-6+12-24+...

a.

–65

c.

–62
b.

–64

d.

–63

((Side note: I tried to find it by working it out then finding the answer but it keeps coming up all funky can whoever answer this please show the proper work too so i can understand on what i'm doing! Thank you bunchs loves!)

Answer 1

3 - 6 + 12 - 24 + 48 - 96 = -63 or D
it is going in a pattern; the next number is always the last number but multiplied by two, and the signs are alternating between - and +
3 x 2 = 6
6 x 2 = 12
12 x 2 = 24
24 x 2 = 48
48 x 2 = 96

add and subtract everything and you get -63