Standard Math Q+A Thread

[cjrig]

Hi, I have two questions.

1. How many kilobytes are there in 2 gigabytes? I'm having trouble solving this one!

2. (a) Alex is buying a used car which has a sale price of $13 380. In addition to the
sale price there are the following costs:
Transfer of registration $30

Stamp Duty .......

(i) Stamp Duty for this car is calculated at $3 for every $100, or part thereof,
of the sale price.

What does "part thereof" mean in this question? First time I've ever seen those words.

Any help is appreciated 

[pughg16]

Hi, I have two questions.

1. How many kilobytes are there in 2 gigabytes? I'm having trouble solving this one!

2. (a) Alex is buying a used car which has a sale price of $13 380. In addition to the
sale price there are the following costs:
Transfer of registration $30

Stamp Duty .......

(i) Stamp Duty for this car is calculated at $3 for every $100, or part thereof,
of the sale price.

What does "part thereof" mean in this question? First time I've ever seen those words.

Any help is appreciated 

Hey!!
Part thereof just means a part of 100 dollars.
I just did that q!
This means that you need to round 13380 up to 13400 so you have the parts of 100, as 80 is included as a part (80 is a part thereof of 100 if you know what I mean)
This means he will pay 134 * $3
Hope you get the part thereof bit!! Sorry, didn't explain it very well!

[pughg16]

Hey! I think thats for calculating the longitudinal difference, not for when to add the hours!

What i do it use a line to indicate whether to add the hours like this:

i hope this is what you were looking for, and not the meridian and gmt stuff

Sorry! I didn't read the post properly!!

[brontem]

Hi, I have two questions.

1. How many kilobytes are there in 2 gigabytes? I'm having trouble solving this one!

2. (a) Alex is buying a used car which has a sale price of $13 380. In addition to the
sale price there are the following costs:
Transfer of registration $30

Stamp Duty .......

(i) Stamp Duty for this car is calculated at $3 for every $100, or part thereof,
of the sale price.

What does "part thereof" mean in this question? First time I've ever seen those words.

Any help is appreciated 

Gb to kb etc conversion is x2^10 - you need to do it twice so it's x2^20
You also have to include the 2 (amount of GB) so:

2gb = 2^1 x 2^10 x 2^10
=2^21
=2097152gb

[cjrig]

Hey!!
Part thereof just means a part of 100 dollars.
I just did that q!
This means that you need to round 13380 up to 13400 so you have the parts of 100, as 80 is included as a part (80 is a part thereof of 100 if you know what I mean)
This means he will pay 134 * $3
Hope you get the part thereof bit!! Sorry, didn't explain it very well!

Ahh ok. What if, for example, the sale price was $13,320, you would round it down to $13,300 right? Or would you round it up to 133,400?

[cjrig]

Gb to kb etc conversion is x2^10 - you need to do it twice so it's x2^20
You also have to include the 2 (amount of GB) so:

2gb = 2^1 x 2^10 x 2^10
=2^21
=2097152gb

Ohhh okay. Why did you put 2^1 in the conversion? Sorry, I'm really bad with file size!

[RuiAce]

Ohhh okay. Why did you put 2^1 in the conversion? Sorry, I'm really bad with file size!

Because there's two gigabytes. Not one gigabyte.

2 Gb = 2 x 2^10 x 10^10


Technically the ^1 was not necessary.

[stephanieazzopardi]

Ohhh okay. Why did you put 2^1 in the conversion? Sorry, I'm really bad with file size!

2^1 is just the same as writing 2 (representing 2 GB) 

[pughg16]

Ahh ok. What if, for example, the sale price was $13,320, you would round it down to $13,300 right? Or would you round it up to 133,400?

Round it up to 13,400. Every unit over 100 is included as a part of the next 100 if you get what i mean

[brontem]

Because there's two gigabytes. Not one gigabyte.

2 Gb = 2 x 2^10 x 10^10


Technically the ^1 was not necessary.

True, unless the question is like this multiple choice (unless it's just me who got caught up ha)

[RuiAce]

True, unless the question is like this multiple choice (unless it's just me who got caught up ha)

The ^1 just makes it clearer. Still not necessary though

[cjrig]

True, unless the question is like this multiple choice (unless it's just me who got caught up ha)

Because there's two gigabytes. Not one gigabyte.

2 Gb = 2 x 2^10 x 10^10


Technically the ^1 was not necessary.

2^1 is just the same as writing 2 (representing 2 GB) 

Yes that question is the one I was doing from the 2014 HSC. I put down 2^20 and was confused when I saw that the answer was 2^21. I understand now, thanks guys. 

[cjrig]

Round it up to 13,400. Every unit over 100 is included as a part of the next 100 if you get what i mean

Yeah I get it now, thanks! 

[pughg16]

Yeah I get it now, thanks! 

No problem, glad to help!! It is a pretty easy thing to trip up on...the 'part thereof'!

[Emilyom]

Just wondering If anyone can help me solve this multiple choice question ? thank you
21 Which equation correctly shows r as the subject of S = 800(1 – r)?
(A) r = 800 – S
             800
(B) r = S – 800
             800
(C) r = 800 – S
(D) r = S – 800