Answer:
20
Step-by-step explanation:
Using the rule of radicals
[tex]\sqrt{a}[/tex] × [tex]\sqrt{b}[/tex] ⇔ [tex]\sqrt{ab}[/tex]
Given
[tex]\sqrt{5}[/tex] × [tex]\sqrt{80}[/tex]
= [tex]\sqrt{5(80)}[/tex]
= [tex]\sqrt{400}[/tex]
= 20
