Question

Help

Answer 1

okay so starts from 5 so we know that 5 is a constant which is added on... now try writing "four less than twice the previous line" as an expression. Let l be the number of marbles in the previous line

Answer 2

12-4

Answer 3

is it 6?

Answer 4

Yep. I got 6 as well.

Answer 5

But thts not a choice :/

Answer 6

wait how did you guys get 6?

Answer 7

I did 2x-4 and but 6 in for x

Answer 8

But you forgot to add the 5 constant

Answer 9

because the line initially starts at 5 marbles

Answer 10

so 11

Answer 11

?

Answer 12

Im gonna try and find a better way to explain this, my explanation is getting messy

Answer 13

Alright thanks

Answer 14

I think the easiest way to do it is to follow the pattern... because I can't find any AP/GP or linear relationship, though there probably is a bette way to do it but anyway this is what I would use...
so line 1: 5 marbles (we are told this)
line 2: 2(5) -4 = 6
line 3: 2(6) - 4 : 8
and so on....
till you get to line 6

Answer 15

14?

Answer 16

I just put 36.

Answer 17

Yeah I got 36 too

Answer 18

the rule is 2*n - 4 where n is the number of marks in the previous line
if you count the number of marks in line 4, you get 12
to find the number of marks in line 5, do 2*12 - 4
that simplifies to 20

now find the number of marks in line 6: 2*20 - 4 = 40-4= 36