Question

please help me
it is of class 9 maths chapter 1 No. system​

Answer 1

1. b)

$\sqrt{5}$

2. a)0.4545

3. irrational

4.2343/999

5.

$\sqrt{2.1}$

$\sqrt{2.5}$

6. I don't know.

7. I don't know

7. Finally I dont know.