the sequence is 10, 6, 2, -2, -6
I'm an A* target trade (level 8 in recent SATS) maths, but I can't think, this is for my cousin in year 7's homework.
2007-10-02 07:18:24 · 6 answers · asked by GeeMail 4 in Science & Mathematics ➔ Mathematics
I know it's decreasing by 4!!
So you're telling me that 1(term) - 4 = 10?
A previous one was
Term (N) - 1 2 3 4 5
Sequence 7 10, 13, 16, 19
Answer = n*3+4
2007-10-02 07:25:24 · update #1
THIS IS FOR A YEAR 7 SET 1, IT'S NOT A LEVEL MATHS OR ANYTHING! ;) JUST THE SIMPLE STUFF!
2007-10-02 07:53:50 · update #2
This is an Arithmetic Progression. To find the Nth term use a+(n-1)d
a=10, d=6-10 which equal -4
10+(n-1)(-4)=10-4n+4=14-4n
14-4n is the Nth term.
2007-10-02 07:52:25 · answer #1 · answered by scratalia 1 · 0⤊ 0⤋
The n-th term is -4n + 14, n = 1, 2, 3, ...
Here's how you find it. Because the terms are in arithmetic progression, the n-th term a_n = an + b, for some constants a and b. Witn n = 1, we get a + b = 10, and with n = 2, we have 2n + b = 6. Solve the two equations in two unknowns to find a - -4 and b = 14.
2007-10-02 14:55:13 · answer #2 · answered by Tony 7 · 0⤊ 0⤋
Let x = the decrementing no.
6 = 10 - x
6 - x = 2
6 = 2 + x
10 - x = 2 + x
2x = 8
x = 4
Answer: decrementing no. = 4
Continuing your sequence:
14, 10, 6, 2, - 2, - 6, - 10, - 14
18, 14, 10, 6, 2, - 2, - 6, - 10, - 14, - 18
2007-10-06 22:19:45 · answer #3 · answered by Jun Agruda 7 · 2⤊ 0⤋
-10
2007-10-02 14:24:13 · answer #4 · answered by Colin T 3 · 0⤊ 2⤋
It is decreasing by 4 each time.
2007-10-02 14:22:48 · answer #5 · answered by KAH 2 · 0⤊ 1⤋
take away 4
N, N-4
2007-10-02 14:22:20 · answer #6 · answered by Anonymous · 0⤊ 1⤋