Using A Calculator

Question 1:

\sqrt{2.544}

1.5949921629902

Question 2:

\sqrt[3]{4.92}

1.7008069986293

Question 3:

\frac{6.23 + 9.68}{8.83 - 5.57}

4.8803680981595

Question 4:

\frac{{3.9}^{2}}{\sqrt{{1.1}^{3} + {6.4}^{3}}}

0.93704297143513