Math Question

<p>Hi everyone!</p>

<p>I'm having a few problems with the question attached below. It has 4 parts. I have already written the answers, but, I'm not sure if they are correct or not. Any help would be greatly appreciated. Thanks!</p>

<p>[url=<a href="http://cl.ly/1y3y2c1t3i2P3i1G0A1x%5DQuestion.jpg%5B/url"&gt;http://cl.ly/1y3y2c1t3i2P3i1G0A1x]Question.jpg[/url&lt;/a&gt;]&lt;/p>