### BARS::AZ County Hwy-153 at AZ Hwy-95

Exercise: Find an equation.

```   [solve for 'n']  4 + 17  = n - 10 - 9
```

Note: This roadsign was submitted to RoadSignMath.com and they posted it to their website.

```   Date: Tue, 11 Oct 2005 20:16:46 -0500
To: Gerald D. Thurman <gthurman@gmail.com>
Subject: Re: roadsign from Arizona

Love the sign! And welcome to Road Sign Math!

This will get posted in a couple of weeks,
some other signs in front of you.
```
##### Update::2009.04.03

This BARS was selected to be one of the BARS of the Week for week #11 of the spring 2009 semester.

```   the numbers are:  4  17  9  40  10

previous math was:  4 + 17 + 9 + 10 = 40

more math:  40 / 10 + 4 + 9 = 17

rsPiEval:  (40 + 4) / (log(10) * (17 - sqrt(9))) = Pi
* 44/14 approximates Pi (3.14) rounded to nearest hundredth

rsPhiEval:  (log(10) + sqrt(40 / (17 - 9))) / sqrt(4) = Phi
* Phi is the golden ratio and it approximates 1.61803399

rsAgeEval:  40 + 17 - 9 + sqrt(4) + log(10) = 51
* MathBabbler was 51 years young when he found this equation

rsAgeEval:  17 * sqrt(9) + 40 / 10 - 4 = 51
* MathBabbler was 51 years young when he found this equation

rsAgeEval:  40 + (17 + sqrt(9)) / 10 * 4 = 48
* RoadHacker was 48 years young when he found this road sign

rs42Eval:  40 + 4 / (9 + 10 - 17) = 42
* 42 is the "Answer to Life, the Universe, and Everything"

rsHwyEval:  17 * 9 + 40 / 10 - 4 = 153
* This road sign is on AZ Hwy-153

rsHwyEval:  17 * sqrt(9) * defactorial(4! / (40 / 10)) = 153
* This road sign is on AZ Hwy-153

rsHwyEval:  17 * sqrt(9) * (log(10) + sqrt(sqrt(40 - 4!))) = 153
* This road sign is on AZ Hwy-153

more math:  (40 / (17 - 9)) - 4 = log(10)

more math:  sqrt(40 + 9) - 4 = cuberoot(17 + 10)

more math:  (sqrt(40 * 10) - 17) * sqrt(4) = sqrt(9)!

[exercise]  17 * sqrt(9) * defactorial(4! / (40 / 10)) = 153
What does  defactorial(4! / (40 / 10))  equal?
```
##### Update::2009.08.27

This BARS was selected to be one of the BARS of the Week for week #2 of the fall 2009 semester.

```   the numbers are:  4  17  9  40  10

rsAgeEval:  40 + 10 + (17 - 9) / 4 = 52
* MathBabbler was 52 years young when he found this equation.

rsStateEval:  40 - 10 + (17 - 9) / 4 = 48
* Arizona was the 48th state admitted to the Union.
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 10 October 2005