Question

25 बाई 16 डिवाइड बाय ब्रैकेट
ब्रैकेट इक्वल टू माइनस फाइव ​

Answer 1

$\Huge{\color{lightblue}{\fbox{\textsf{\textbf{αηsωεя}}}}}$

$\sqrt{4}$= 2 where 2 is a rational number . Here n is perfect square the $\sqrt{n}$ is rational number

$\sqrt{5}$ = 2.236.. is not rational number But it is irrational number.here n is not a perfect square the $\sqrt{n}$ is irrational number

So $\sqrt{n}$ is not irrational number if n is perfect square.

Answer 2

$\huge\boxed{\fcolorbox{black}{blue}{αηsωєя}}$

History is the scientific study of the past. Events occurring before the invention of writing systems are considered prehistory. "History" is an umbrella term that relates to past events as well as the memory, discovery, collection, organization, presentation, and interpretation of information about these events.

hope it helps