Question

Find a pattern for each sequence. Use the pattern to identify the next two terms or figures.
1. 3, -6, 18, -72, 360
-500; 10,600
-2,160; 15,120
-4,320; 20,113
2,160; 15,120

Answer 1

might be geometeric since it alternates signs like that

Answer 2

or it could be some random variation .... hmmm

Answer 3

3(-2) = -6
-6(-3) = 18
18(-4) = -72 ... that seems to work

Answer 4

so whats the pattern?

Answer 5

A{n} = A{n-1}*(-1)^n*(n+1) looks plausible for an equation to solve? the easiest thing to do is just brute math it once you see the pattern

Answer 6

still typeing? lol :)

Answer 7

A{n} = -(n) *A{n-1}

A{2} = -(2) * (3) = -6
A{3} = -(3) * (-6) = 18
A{4} = -(4) * (18) = -72

trying to see whats in the question ☺

Answer 8

ok ill wait :)

Answer 9

3, -6, 18, -72, 360 -500; <- whats the semicolon for?

10,600 -2,160; <- are these different sequences?

15,120 -4,320;

20,113 2,160;

15,120

Answer 10

i think I see it now; those are the answer choices right ☺

Answer 11

yes :)

Answer 12

Q1
3, -6, 18, -72, 360

a) -500; 10,600

b) -2,160; 15,120

c) -4,320; 20,113

d) 2,160; 15,120

...formating helps to understand the question ;)

Answer 13

so how would i do that?

Answer 14

we know the next one is - so d is out

Answer 15

format? just hit enter while typing the question

the enter key doesnt "post"; you actually have to click or tab over to the post

Answer 16

oh ok

Answer 17

we want 6 and 7

A{n} = -(n) * A{n-1}
A{6} = -(6) * 360 = -2160

and the only option for that is 'b'; but lets carry it out to the end

A{7} = -(7) * -2160 = 15120

Answer 18

ok

Answer 19

I was going to try to find a particular equation to solve; but since it was so small, i figured...nah lol

Answer 20

lol :D thanks soo much!