We have

**√**4 = 2 =2/1

**√**4 can be written in the form of p/q, so it is a rational number.

Its decimal representation is 2.0.

We have,

3**√**18 = 3**√**2 x 3 x 3

= 3 x 3**√**2

= 9**√**2

Since, the product of a rations and an irrational is an irrational number.

9**√**2 is an irrational

=> 3 **√**18 is an irrational number.

We have,

**√**1.44 = **√**144/100

=12/10

=1.2

Every terminating decimal is a rational number, so 1.2 is a rational number. Its decimal representation is 1.2.

We have,

**√**9/27 = 3/**√**27 = 3/**√**3 x 3 x 3

=3/3**√**3

=1/**√**3

Quotient of a rational and an irrational number is irrational numbers so 1/**√**3 is an irrational number.

=>**√**9/27 is an irrational number.

We have,

-**√**64 = -**√**8 x 8

= -8

= -8/1

-**√** 64 can be expressed in the form of p/q ,so -**√**64 is a rotational number.

Its decimal representation is -8.0.

We have,

**√**100=10

=10/1

**√**100 can be expressed in the form of p/q, so **√**100 is a rational number.

The decimal representation of **√**100 is 10.0.