$\sqrt{10} \times \sqrt{15}$ is equal to

The product of any two irrational numbers is

Insert a rational number and an irrational number between the following:
$0$ and $0.1$

Find the value of the following expression correct to three decimal places,rationalizing the denominator if needed. Take $\sqrt{2} = 1.414$,$\sqrt{3} = 1.732$,and $\sqrt{5} = 2.236$.
$\frac{4}{3 \sqrt{3}-2 \sqrt{2}} + \frac{3}{3 \sqrt{3}+2 \sqrt{2}}$

Represent $\sqrt{8.2}$ on the number line.

Which of the following is irrational?