# Math Help - Could someone please check my answer to some simple questions?

1. ## Could someone please check my answer to some simple questions?

Hi,can anyone check my answers for the following questions:

1. c
2. A
3. A
4. A
5. D
6. B
7. C
8. D
9. A
10.c
11.c
12.D
13.B
14.B
15.D
16.C
17.A
18.B
19.B
20. D

Thx

2. Originally Posted by toprun91
Hi,can anyone check my answers for the following questions:

1. c
2. A wrong
3. A
4. A
5. D wrong
6. B
7. C
8. D
9. A
10.c
11.c
12.D
13.B
14.B
15.D
16.C
17.A
18.B
19.B
20. D

Thx
2 and 5 are wrong. So, what percent did you get wrong?

3. Originally Posted by toprun91
Hi,can anyone check my answers for the following questions:

1. c
2. A <<<<<<< I've got a different result
3. A
4. A
5. D
6. B
7. C
8. D
9. A
10.c
11.c
12.D
13.B
14.B <<<<<<< I've got a different result
15.D
16.C
17.A
18.B
19.B
20. D

Thx
...

4. Originally Posted by VonNemo19
2 and 5 are wrong. So, what percent did you get wrong?
Yer srry 2. was a silly mistake i can now see it was 10 cents or answer c right? But r u sure about 5 i checked that about 10 times and think i am right. because D) gives 48 which is not 12. What did you get for 5 and why

Originally Posted by earboth
1. c
2. A <<<<<<< I've got a different result
3. A
4. A
5. D
6. B
7. C
8. D
9. A
10.c
11.c
12.D
13.B
14.B <<<<<<< I've got a different result
15.D
16.C
17.A
18.B
19.B
20. D

Thx.
I can see that 14 is not right and i think it could be a) but how do you work out a question like this. what i did was divided square root of 5 by 100 and squared it. Is that right?

5. Originally Posted by toprun91
Yer srry 2. was a silly mistake i can now see it was 10 cents or answer c right? But r u sure about 5 i checked that about 10 times and think i am right. because D) gives 48 which is not 12. What did you get for 5 and why

I can see that 14 is not right and i think it could be a) but how do you work out a question like this. what i did was divided square root of 5 by 100 and squared it. Is that right?
Definitely no, because only the length unit is squared, not the amount.

You are supposed to know that

$1\ m^2 = 100\ cm \cdot 100\ cm = 10,000\ cm^2$

Use proportions:

$\dfrac{x}{5\ cm^2} = \dfrac{1\ m^2}{10,000\ cm^2}~\implies~x=\dfrac5{10,000}\ m^2 = 0.0005\ m^2$

6. Originally Posted by earboth
Definitely no, because only the length unit is squared, not the amount.

You are supposed to know that

$1\ m^2 = 100\ cm \cdot 100\ cm = 10,000\ cm^2$

Use proportions:

$\dfrac{x}{5\ cm^2} = \dfrac{1\ m^2}{10,000\ cm^2}~\implies~x=\dfrac5{10,000}\ m^2 = 0.0005\ m^2$
is there any other way you could do it, that is a bit confusing? Also did I get 5 right?

7. Originally Posted by toprun91
... Also did I get 5 right?
Right. (The trouble with those large images you used is that the divide-sign pretty much looks like a +)

8. question 14 is definietly D. I am not precise with 2 sorry.

9. And question 5 isn't wrong.

10. Originally Posted by Awsom Guy
question 14 is definietly D. I am not precise with 2 sorry.
Are you sure 14 is D. I keep getting A. this is how i do it
I figure $5cm^2$ is the same as this:

= $5cm^2$

So then i divided both by 100 converting it into meters:

Then i multiply both sides to get it in square metres:

and that is why i get A. Are you sure i am wrong. Why? maybe earboth knows