What is the radical form for 2.5?

Hint: We are asked to write the radical form of the given number in the question. So, for that we need to be aware of power and exponents and also with the fractional power of numbers and then writing it as the root.

Complete step-by-step answer:
In the given question, simply we are asked to write the radical form of the given number which is 2.5
When we are asked to write the radical form of any number it basically means that we need to write the number in such a way that square root is involved.
Now, for the given question we have 2.5 as a number which we need to write in equivalence of square root. So for this we will find the square of the given number 2.5 and then write that square number inside the root, after this we would be able to clearly observe that the square root of the squared number would be equal to the given number and hence we will attain the radical form of 2.5
So,
$\begin{align}
  & {{\left( 2.5 \right)}^{2}}=6.25 \\
 & \Rightarrow 2.5=\sqrt{6.25} \\
\end{align}$
Therefore, the radical form of the number given in the question is $\sqrt{6.25}$.

Note: In this question is not very tough what we need to do is take care while bringing the numbers out of the root and then simplifying. Also, we must know how we need to write fractional power as the root of that denominator term.