Question

what is the 20th term of the sequence that begins -3,6,-12,24

A.-524,288
B.524,288
C.1,572,864
D.3,145,728

Answer 1

looks this is a geometri sequence, right ?

Answer 2

with a1 = -3 and ration (r) = -2

Answer 3

use the formula ;
an = a1 * r^(n-1)

Answer 4

so,
a20 = a1 * r^(20 - 1) = a1 * r^19

Answer 5

so is it 1,572,864?, thats what i got when i used that formula

Answer 6

yes, i got like yours
good job :)

Answer 7

thank you for the help!

Answer 8

wlcm