Please help with this maths on math watch! It’s roots and surds i think this includes rationalising the denominator but i have absolutely no idea which is why i need help!!

Answer:
2
Step-by-step explanation:
ac/b =
[tex] \sqrt{ \frac{2 \times 10}{5} } = \sqrt{ \frac{20}{5} } = \sqrt{4} = 2[/tex]