Question

Help! Please and thank you!

Which numbers are greater than 3 × 10−7?

Choose all answers that are correct.

A.
9 × 10−9

B.
2 × 10−5

C.
6 × 10−7

D.
5 × 10−8

E.
2 × 10−7

Answer 1

A,C and D

Answer 2

Thanks mate.

Answer 3

wrong, B and C

Answer 4

You sure? Please explain.

Answer 5

3*10^-7 = 0.0000003

in other words a 3 with the decimal point placed 7 spaces to the left

Answer 6

A.C and D based on first to do multiplication and then addition or subtraction in any calculation.

Answer 7

the more you move the decimal to the left, the smaller the number becomes

Answer 8

thus, the ones with the smallest negative number in the exponent are in fact bigger numbers

Answer 9

I understand now. Thank you. Do you have time for more?

Answer 10

Does the question given have the terms to the power raised or is it the subtraction

Answer 11

oh wait, i read them as \(3 × 10^{−7}\) etc. did i read that correctly?

Answer 12

If the question is referred to the power raised then zimmah is right B and c

Answer 13

\(3 * 10^{-7}\)

Answer 14

Yes Zimmah.
Thats it.

Answer 15

Sorry, I was unclear.

Answer 16

that's what i assumed because they talked about numbers and not about equations, but you could indeed read it in another way now that i think about it. glad it's solved anyway

Answer 17

Thanks. Do you have time for more?

Answer 18

yes

Answer 19

What is the best order-of-magnitude estimate for 789,000?

A.
107

B.
106

C.
105

D.
104

Answer 20

it has 6 digits, so 10^6

Answer 21

however you could argue it's closer to 1000000 than it is to 100000

Answer 22

Thank you. This is the last one.

What is the best order-of-magnitude estimate for 0.0008?

A.
10^-3

B.
10^-4

C.
10^-5

D.
10^-6

Answer 23

oh in fact 6 digits would be 10^5

Answer 24

a 1 with 5 zeroes, makes 6 digits

Answer 25

Yes thats what i thought, but your answer is most likely more correct than mine.

Answer 26

well this one also depends on how you interpret it, if you argue 0.001 is closer to 0.0008 than 10^-3 would be closest

if you ignore that fact and just want to look at the amount of decimals than you should pick 10^-4

Answer 27

I think it would be 10^-3. What would you answer?

Answer 28

i'm not sure what the rules are, i'm not sure if you are allowed to round or not

Answer 29

the umber itself is in fact an order of 10^-4 but if you round it up it's actually 10^-3

Answer 30

Unfortunately in not sure what the rules are either. This was all i was given. I think i will go with 10^-3.

Answer 31

alright, make sure you ask the teacher next time you see him/her

Answer 32

Thank you.

Answer 33

if u are veiwing this it is incorrect