Question

*This Question Has 3 Questions in it

Answer 1

Answer:

Ques 1: 7.85

Ques 2: both $\sqrt{0.25}$ and $-\sqrt{16}$ are rational.

Ques 3: 0.9

Step-by-step explanation:

Ques 1:

Solving the $\sqrt{61.6}$, we get 7.8485.

Rounding off to nearest hundredth, we see that next digit is 8, so we increase the previous digit by 1.

So, the answer to nearest hundredth is 7.85.

Ques 2:

$\sqrt{0.25}$ and $-\sqrt{16}$to be checked  whether they are rational or irrational.

We know that $\sqrt{16}$ is equal to 4.

$-\sqrt{16}$ = -4 which is a rational value.

Let us solve $\sqrt{0.25}$ now.

$\sqrt{0.25} = \sqrt{\dfrac{25}{100}}\\\Rightarrow \dfrac{5}{10}$

Which is a rational value.

So, both are rational.

Ques 3:

Simplify $\sqrt{0.81}$

0.81 can be written as $\frac{81}{100}$ in rational form.

Now, taking the square root, we need to take the square root for both Numerator and Denominator and then we can divide to get the desired square root.

$\sqrt{0.81} = \sqrt{\dfrac{81}{100}}\\\Rightarrow \dfrac{9}{10} = \bold{0.9}$

So, the answers are:

Ques 1: 7.85

Ques 2: both $\sqrt{0.25}$ and $-\sqrt{16}$ are rational.

Ques 3: 0.9