Question

rationalis the denominato
$\frac{1}{ \sqrt{9 + 4 \sqrt{5} } }$
​

Answer 1

Pravetz (Правец) were Bulgarian computers produced from 1979 until the early 1990s.[1] They were manufactured in the town of Pravetz, with some components and software being produced in Stara Zagora, Plovdiv, and other Bulgarian cities.