Answer:
21 feet of railing is needed
Explanation:
The diagram which was not included by I know it because I have it for homework this weekend shows the area of the deck:
![x^(2) + 8^(2)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mlnmeoc56fmnz6hn150bbezl6jd3rn2pb7.png)
Since we know the area of the deck is 223 square feet:
= 223
Find 8^{2}[/tex] :
8^{2}[/tex] = 64
![x^(2) + 64 = 223</p><p></p><p>223 - 64 </p><p>=> 169</p><p></p><p><u><strong>So,</strong></u></p><p></p><p>[tex]x^(2) = 169</p><p></p><p><u><strong>Find square root of 169:</strong></u></p><p></p><p>[tex]√(169) = <strong>13](https://img.qammunity.org/2020/formulas/mathematics/middle-school/vp9nxdkrebgj5rqti1oygj51lra40qbvkn.png)
[tex]x^{2} = 13
Find the longest edge:
x + 8 = 13 + 8
=> 21