Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

yeah am sorry for that ill try to post the question correct

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

for 11 i got c

11. How many centimeters are in two kilometers? Give your answer in scientific notation.

A 2 x 10^2

B 1 x 10^5

C 2 x 10^5

D 2 x 10^3

E 1 x 10^2

F 3 x 10^2

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

Excellent. That's correct!

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

hey

for #12 i got b

for #13-i got c

12. How many grams are in 4,247 mg? Give your answer in standard notation.

A 42.47

B 4.247

C 42

D 4247

E 424.7

F 424

13. How many microliters are in a two liter bottle of soda? Write your answer in scientific notation.

A 1 x 10^3

B 1 x 10^6

C 2 x 10^3

D 2 x 10^5

E 2 x 10^6

F 3 x 10^4

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

hi zee-f

b is correct for 12.

In 13 I think you got mixed up between milli-liter (=1/1000 liter) and micro-liter (=1/1000 000 liter).

Try again?

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

so am ganna have 2/2000000

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

so my answer would be e?

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

Er, what do you mean 2/2000000.

I'd be happy with one of the letters.

Which is the correct choice then?

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

the correct choice i think is E

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

and I think so too.

WELL DONE!

Bob

sorry I missed your earlier post. I think we both pressed submit at the same time.

*Last edited by bob bundy (2011-07-06 07:42:27)*

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

no its ok thanx alot for the help

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

am still working on the rest

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

I'll check back from time to time to see.

Look to see if I'm still **Online**.

Bob

*Last edited by bob bundy (2011-07-06 07:53:28)*

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

like for 14 i posted a picture earlier am confused how to answer it i know that 3.25 kilograms =3250000 milligrams

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

14. Examine the following solution to a conversion problem. Do you see a mistake? If so, identify the location of the first mistake and explain why it is incorrect.

A The conversion is not possible.

B The first problem occurs in column (1). The problem should begin with mg.

C The first problem occurs in column (2). 1 kg is not equal to 1000 g, so that should not be used as the conversion factor.

D The first problem occurs in column (2). The conversion factor is upside down (grams should be on top, and kg should be on bottom).

E The first problem occurs in column (4). The multiplication and division was performed incorrectly.

FNo mistakes

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

hi zee-f

Yes, I've seen the picture.

And your conversion in post #64 is correct.

And that's not what the picture says, so there's a mistake somewhere. Once a mistake has occurred what follows may also be wrong (because of a double error or because the first error messes up the rest) so you only have to find the first error.

And say where it occurs by giving the number (1) or (2) or .....

What do you think?

Are you sure you have the possible answers copied correctly because no line describes exactly what has gone wrong. Answer D has column (2) again. Should this be a (3) ?

Bob

*Last edited by bob bundy (2011-07-06 08:23:56)*

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

so i think its C thats my answer am not sure tho :?

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

C ?

But 1000g is 1Kg! Kilo means 1000 so Kilogram = 1000 grams

Bob

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

they multiply incorrect so its E

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

That's what I think.

I've not seen conversions done in a table like this, but I think my diagram below shows what is intended.

And that means it should be multiply then multiply again.

Bob

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

yup yup yup

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

for 15 its correct because 127.2 mm=12.72 centimeters

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

Well yes, I agree, but I still find this way of converting puzzling.

Why would you change to cm via meters.

Ho hum, let's push on. Maybe the next one will make more sense.

Bob

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

am confused on the sign in 16 what dose it stand for ???

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,654

Do you mean this one:

That's a Greek letter 'mu'. It's used to stand for 'micro' = 1/1000 000

so

Bob

*Last edited by bob bundy (2011-07-06 09:58:40)*

Offline