a:1:{i:0;a:13:{s:2:"id";s:3:"615";s:7:"answer1";s:201:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=f'(x)%3D%5Cfrac%7B1%7D%7B%5Csqrt%5B6%5D%7Bx%7D%7D" alt="f'(x)=\frac{1}{\sqrt[6]{x}}" /></p>";s:7:"answer2";s:209:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=f'(x)%3D%5Cfrac%7B9%5Csqrt%5B6%5D%7Bx%5E7%7D%7D%7B2%7D" alt="f'(x)=\frac{9\sqrt[6]{x^7}}{2}" /></p>";s:7:"answer3";s:193:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=f'(x)%3D%5Cfrac%7B3%5Csqrt%7Bx%7D%7D%7B2%7D" alt="f'(x)=\frac{3\sqrt{x}}{2}" /></p>";s:7:"answer4";s:203:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=f'(x)%3D%5Cfrac%7B7%5Csqrt%5B6%5D%7Bx%7D%7D%7B6%7D" alt="f'(x)=\frac{7\sqrt[6]{x}}{6}" /></p>";s:7:"answer5";s:0:"";s:7:"answer6";s:0:"";s:7:"answer7";s:0:"";s:7:"answer8";s:0:"";s:7:"answer9";s:0:"";s:8:"answer10";s:0:"";s:4:"good";s:10:"0001000000";s:8:"question";s:4:"1875";}}