1 <p>You need to use the tags you learned in the chapter on<a>text markup</a>. Follow the example and choose the appropriate text tags.</p>

2 <p>This additional version of the<a>challenge</a>is designed to reinforce your text markup skills.</p>

3 <p><strong>Solution</strong></p>

4 <p>The solution to the challenge will be available in a few minutes. Use it if you encounter difficulties. In the meantime, try to complete the challenge on your own.</p>

5 &lt;!DOCTYPE html&gt; &lt;html lang="en"&gt; &lt;head&gt; &lt;meta charset="UTF-8"&gt; &lt;title&gt;Mathematical Formulas&lt;/title&gt; &lt;link rel="stylesheet" href="style.css"&gt; &lt;/head&gt; &lt;body&gt; &lt;h1&gt;Mathematical Formulas&lt;/h1&gt; &lt;p&gt; The formula for the area of a square: a&lt;sup&gt;2&lt;/sup&gt;. The square root of number b is written as √b. &lt;/p&gt; &lt;p&gt; In algebra, indices are also used: x&lt;sub&gt;1&lt;/sub&gt;, x&lt;sub&gt;2&lt;/sub&gt; are the roots of the equation. &lt;/p&gt; &lt;/body&gt; &lt;/html&gt;