
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
April 13th, 2018, 12:40 AM  #1 
Member Joined: Apr 2018 From: On Earth Posts: 34 Thanks: 0  Please help with Paper Question!
I do not really know how I should go about doing question number 4c, which I have highlighted in yellow. If i knew how to do 4C I am pretty sure that I would be able to do the next questions, but I am stuck on this, please help!
Last edited by Student2018; April 13th, 2018 at 12:53 AM. 
April 13th, 2018, 12:46 AM  #2 
Senior Member Joined: Oct 2009 Posts: 693 Thanks: 227 
I can't read anything on the attachment

April 13th, 2018, 12:57 AM  #3 
Member Joined: Apr 2018 From: On Earth Posts: 34 Thanks: 0  This should be better
This should be better

April 16th, 2018, 07:59 AM  #4 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,261 Thanks: 895 
I don't see a "4" so I assume that the (a), (b), (c), etc. on the page are all problem 4. Basically you start with a paper size "$\displaystyle A_0$", of area 1 square meter and make smaller sheets by cutting the previous sheet in half. So $\displaystyle A_1$ has area 1/2(1)= 1/2 square meter, $\displaystyle A_2$ has area have of that (1/2)(1/2)= 1/4, $\displaystyle A_3$ has area half of that, (1/2)(1/4)= 1/8, etc. Since we are just multiplying by 2 in the denominator we have powers of 2 in the denominator: $\displaystyle A_n$ has area $\displaystyle frac{1}{2^n}$. That was question (a) and you were able to do that, right? For the next question we are told that the dimensions of $\displaystyle A_4$ are x meters long and y meters wide. $\displaystyle A_3$ is formed by putting two of those together, length wise. So $\displaystyle A_3$ has length x m still but width 2y m. That is (b) and, since you are not asking about (b), you were able to do that, correct? Now (c) asks us to use both (a), that $\displaystyle A_n$ area $\displaystyle \frac{1}{2^n}$ square meters, and (b). that while [math]A_4[math] has length x m and width y m, $\displaystyle A_3$ has length x m and width 2ym to determine x and y separately. I'm not sure we really use the results of (a) and (b)! I would simply note that original sheet $\displaystyle A_0$ had both length and width 1. Since we keep the same length, cutting only lengthwise each time, halving the width, the length of $\displaystyle A_n$ is x= 1 while the width is $\displaystyle \frac{1}{2^n}$ m. 
April 16th, 2018, 08:23 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 20,101 Thanks: 1905 
They're all question 4, as can be seen in this pdf file.


Tags 
paper, question 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Question about Dedekind's paper "Continuity and Irrational Numbers"  Yosef  Number Theory  4  July 12th, 2017 11:46 AM 
Can Anyone find X on this paper?  Gobsheite  Trigonometry  7  June 27th, 2017 07:46 PM 
Rock Paper Scissors Probability Question  EvanJ  Advanced Statistics  15  August 13th, 2014 03:34 PM 
Differentiation exam paper question  Mediocre1981  Calculus  4  August 29th, 2008 01:58 PM 
the paper  bigli  Real Analysis  3  May 22nd, 2007 11:00 AM 