12,3,-6,-15,?
2007-01-02 13:17:55 · 13 answers · asked by bottle of rum 1 in Science & Mathematics ➔ Mathematics
-24
the sequence subtracts 9 each time
2007-01-02 13:19:57 · answer #1 · answered by TheThing 2 · 1⤊ 0⤋
One possibility is -24. Each number in the sequence is the last number -9.
12 -9 = 3
3 - 9 = -6
-6 - 9 = -15
-15 - 9 = -24
2007-01-02 21:20:47 · answer #2 · answered by Edgar Greenberg 5 · 0⤊ 0⤋
Arithmetic Sequence
an = a1 + (n - 1)d
an = 12 + (-9)(n - 1)
an = 12 - 9(n - 1)
A1 = 12 - 9(1 - 1) = 12 - 9(0) = 12
A2 = 12 - 9(2 - 1) = 12 - 9 = 3
A3 = 12 - 9(3 - 1) = 12 - 9(2) = 12 - 18 = -6
A4 = 12 - 9(4 - 1) = 12 - 9(3) = 12 - 27 = -15
A5 = 12 - 9(5 - 1) = 12 - 9(4) = 12 - 36 = -24
A6 = 12 - 9(6 - 1) = 12 - 9(5) = 12 - 45 = -33
2007-01-02 23:14:10 · answer #3 · answered by Sherman81 6 · 0⤊ 0⤋
The sequence is just to subract 9 from the previous number. This makes the correct answer -24.
2007-01-02 21:20:50 · answer #4 · answered by Nick R 4 · 0⤊ 0⤋
With 9 as the key, the answer you are looking for is -24
2007-01-02 21:21:18 · answer #5 · answered by T's CRM SCNE 3 · 0⤊ 0⤋
-24
2007-01-02 21:49:06 · answer #6 · answered by Anonymous · 0⤊ 0⤋
-24
2007-01-02 21:21:02 · answer #7 · answered by timeless_echo 3 · 0⤊ 0⤋
-24
2007-01-02 21:20:16 · answer #8 · answered by Anonymous · 1⤊ 0⤋
-24
2007-01-02 21:20:10 · answer #9 · answered by Vovó (Grandma) 7 · 1⤊ 0⤋
-24
2007-01-02 21:20:36 · answer #10 · answered by A.J. 2 · 0⤊ 0⤋
-24 is next
2007-01-02 21:23:05 · answer #11 · answered by Anonymous · 0⤊ 0⤋