Question

write 39 1/5 as a radical (i.e. as a root)

Answer 1

Hello.

To find the square root of this expression...
First, look at the "number" part of your expression, the numerator
of the fraction simplifies like this: 391 = 1  .
The denominator of the fraction simplifies like this: 5 = 1  .
So, the whole fraction simplifies like this:
 391/5 = 1  

Have a nice day

Answer 2

First write 39 1/5 as a proper fraction.

39 1/5 =196/5

A radical number should have a root symbol. To make this number has a root symbol and maintain its value, we have to square it. 

(196/5)² = 38,416/25

∴ 39 1/5 = (√38,416)/(√25)   or

              = √1,536.64