Question

Identify the sequence as arithmetic, geometric, or neither. Explain your answer.

1.6, 0.8, 0.4, 0.2, . . .

I think it is geometric - divisible by 1/2...? Is that right?

Answer 1

correct (though imprecise English)

Answer 2

can you tell me how it should be stated then Steve?

Answer 3

How should it stated?

Answer 4

the problem is the "divisible"
divisible by 1/2 means that something is a multiple of 1/2, such as 1,7/2, etc.
2/7 is not divisible by 1/2

Now, for our sequence, one usually states how each successive term is generated, in this case

divide by 2
or
multiply by 1/2

algebraically,
a = 1.6
r = 1/2
where a is the 1st term and r is the ratio between terms.

Answer 5

ok - I understand - thank you for explaining

Answer 6

His answer is totally wrong. each term is is being multiplied by 2.

Answer 7

So its geometric sequence.

Answer 8

Amanda is correct.

Answer 9

Amanda's answer is not correct. 1.6 multiplied by two is not 0.8, it is 3.2 so that's incorrect. 1.6 divided by two is actually 0.8 so the answer Steve provided is factual.