Hi,can anyone check my answers for the following questions:
My answers were:
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
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
$\displaystyle 1\ m^2 = 100\ cm \cdot 100\ cm = 10,000\ cm^2$
Use proportions:
$\displaystyle \dfrac{x}{5\ cm^2} = \dfrac{1\ m^2}{10,000\ cm^2}~\implies~x=\dfrac5{10,000}\ m^2 = 0.0005\ m^2$
Are you sure 14 is D. I keep getting A. this is how i do it
I figure $\displaystyle 5cm^2$ is the same as this:
=$\displaystyle 5cm^2$
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