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 July 21st, 2016, 02:54 AM #1 Newbie   Joined: Jul 2016 From: England Posts: 2 Thanks: 2 Predicting outcome formula Hi all, I was hoping someone might be able to help me with a maths related question. I'm wondering if there is a formula for predicting the value of something based on precedence. So for example: If 90 = 280, 100 = 250 and 110 = 230, what does 120 equal? (these numbers are just examples) Thanks! Thanks from manus July 21st, 2016, 01:32 PM #2 Global Moderator   Joined: May 2007 Posts: 6,807 Thanks: 717 The simplest function to fit 3 points is a parabola. Get the 3 coefficients by using the 3 values you have and then compute the value at the fourth point. parabola $\displaystyle y=ax^2+bx+c$. (x,y) pairs are (90,280), (100,250), (110,230). You now have 3 equations in 3 unknowns (a,b,c). Thanks from manus July 22nd, 2016, 12:21 AM #3 Newbie   Joined: Jul 2016 From: England Posts: 2 Thanks: 2 Hi, thanks for getting back to me. I am extremely new to this so there are a few things I don't understand. In the formula you shared, is Y the number I'm looking for? And what is X? Thanks from manus July 22nd, 2016, 01:32 PM #4 Global Moderator   Joined: May 2007 Posts: 6,807 Thanks: 717 (x,y) is a general point on the curve. You know three specific points and you are (assuming a parabola) getting the general formula. Once you have the formula, then let x=120 to get what you are looking for (=y). Thanks from manus July 22nd, 2016, 07:54 PM #5 Senior Member   Joined: Dec 2015 From: holland Posts: 162 Thanks: 37 Math Focus: tetration The answer is 220 it is a second degree polynome. Thanks from manous Tags formula, outcome, predicting Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Staty Probability and Statistics 5 March 24th, 2016 11:31 AM Keroro Algebra 2 June 5th, 2012 12:03 PM ilovetheflowguy Algebra 3 November 27th, 2011 10:23 AM jkuboschek Advanced Statistics 3 March 29th, 2009 09:30 PM Algebra 2 September 12th, 2008 03:07 PM

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