The value of $\sqrt{900}+\sqrt{0.09}-\sqrt{0.000009}$ is

The correct option is A: $\left(30.297\right)$
We know that,

$\sqrt{900}=\sqrt{30\times 30}=30$

$\sqrt{0.09}=\sqrt{\left(\frac{9}{100}\right)}=\sqrt{\frac{3\times 3}{10\times 10}}=\frac{3}{10}=0.3$

$\sqrt{0.000009}=\sqrt{\left(\frac{9}{1000000}\right)}=\sqrt{\frac{3\times 3}{1000\times 1000}}=\frac{3}{1000}=0.003$

$\sqrt{900}+\sqrt{0.09}-\sqrt{0.000009}$

$=30+0.3-0.003\left(\text{putting the above values}\right)$

$=30.3-0.003$

$=30.297$

Therefore, the required answer is $30+0.3-0.003=30.297$