Question

PLEASE HELP! FAN AND MEDAL
What are the missing values in the following geometric sequence?

__, 10, 5, __, __.

Answer 1

Is this all the information given?

Answer 2

yes and then the answers. I know I need to find the common ratio but i dont know how exactly

Answer 3

What are the choices

Answer 4

20, start fraction five over two end fraction comma start fraction five over four end fraction
15, 0, −5
20, 1, start fraction one over two end fraction
−20, start fraction five over two end fraction comma negative start fraction five over four end fraction

Answer 5

Okay so it is given: 10, 5
What could have done?
10/2=5?

Answer 6

If so, then the first digit must have been 20

Answer 7

okay but I thought I would of had to multiply

Answer 8

so 20, 10, 5, 5/2, 5/4

Answer 9

Could you help me with a few more?

Answer 10

You would have if the geometric sequence was going up.. but since 10 came before 5.. you divide by 2

Answer 11

Oh that makes sense! thank you so much

Answer 12

Two geometric means are inserted between 6 and 384 so the four numbers form a geometric sequence. What are these two numbers?

Hint: an = a1(r)n − 1, where a1 is the first term and r is the common ratio.

Answer 13

an=a1(r)^n-1

Answer 14

Okay, sorry I was helping someone..

Answer 15

So we have 6,___, ___, 384 right

Answer 16

its okay! no rush :) I appreciate you helping me

Answer 17

−24, 96
−24, −96
24, 96
22, 108
these are the answers

Answer 18

yes

Answer 19

so i would divide?

Answer 20

Alright.. simple.. this time we multiply because 6 is the first term and we have to get to 384.

Answer 21

actually I take that back I would multiply because its going up

Answer 22

you would multiply by 2?

Answer 23

So from 6 what do we multiply to get to the second term and the same to the third term and to the last term?

Try numbers from 1-9 and see...

Answer 24

So 6 x (a number) = ans
ans x (a number) = ans2
ans2 x (a number) = ans3
ans3 x (a number) = 384

Answer 25

the (a number) must be the same

Answer 26

Definitely not a 1, 2, 3 because you will get a last term lower than 384, right?

Answer 27

Not 9, 8, 7, 6 because the last term will be too high.. try 4 and 5

Answer 28

6(x), N(x), N(x), 384
6(4), 24(4), 96(4), 384

Match? 24 and 96