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May 2nd, 2017, 04:17 AM  #1 
Newbie Joined: May 2017 From: australia Posts: 4 Thanks: 0  I am not sure whether there is an equation to approach the value
My cousin was doing some maths, but he did not have any idea how to resolve it. I don't know equation, so I post it here and hope someone kindly help him figure out whether there is an equation that can approximate the value of X. Here are the results, but with an unknown value x: When Altitude (y) = 0.119, f(y) = 4.9 Altitude (y) = 0.1199, f(y) = 4.99 Altitude (y) = 0.11999, f(y) = 4.999 Altitude (y) = 0.12, f(y) = x Altitude (y) = 0.12001, f(y) = 5.001 Altitude (y) = 0.1201, f(y) = 5.01 Altitude (y) = 0.121, f(y) = 5.1 What is the value of x? This is my first time posting a maths question in this forum; please forgive me if my questions violate the rules. Thank you. Last edited by skipjack; May 2nd, 2017 at 10:34 AM. 
May 2nd, 2017, 06:03 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,579 Thanks: 1275 
here is one possible function that is continuous ... $f(y) = 100y7 \implies f(0.12) = 5$ then again, here is a function with a discontinuity at $y=0.12$, i.e., $f(0.12)$ is undefined, but will yield the same values as given in your table ... $f(y) = \dfrac{(100y7)(100y12)}{100y12}$ 
May 2nd, 2017, 06:22 AM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 9,782 Thanks: 651  
May 2nd, 2017, 06:29 AM  #4 
Newbie Joined: May 2017 From: australia Posts: 4 Thanks: 0  Thank you Denis. I can't tell you much about my profile. (She is korean and her English isn't good enough) Last edited by kittystackexchange; May 2nd, 2017 at 06:45 AM. 
May 2nd, 2017, 06:30 AM  #5  
Newbie Joined: May 2017 From: australia Posts: 4 Thanks: 0  Quote:
Last edited by kittystackexchange; May 2nd, 2017 at 06:43 AM.  
May 2nd, 2017, 07:36 AM  #6 
Newbie Joined: May 2017 From: australia Posts: 4 Thanks: 0 
I wanted to add some more information, but the edit button is gone

May 2nd, 2017, 08:02 AM  #7 
Math Team Joined: Jul 2011 From: Texas Posts: 2,579 Thanks: 1275  

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