What is the value of $(2.3+1.7)^{2}-(2.3-1.7)^{2} ?$

What is the value of $\frac{2.75 \times 2.75 \times 2.75 - 2.25 \times 2.25 \times 2.25}{2.75 \times 2.75 + 2.75 \times 2.25 + 2.25 \times 2.25}$?

$48.95 - 32.006 = ?$

If $x = 1 + \sqrt{2} + \sqrt{3},$ then find the value of $x^{2} - 2x + 4$.

If $x(3 - \frac{2}{x}) = \frac{3}{x}, x \neq 0,$ then the value of $x^2 + \frac{1}{x^2}$ is

Seema bought $20$ pens,$8$ packets of wax colours,$6$ calculators,and $7$ pencil boxes. The price of a pen is $Rs. 7$,a packet of wax colour is $Rs. 22$,a calculator is $Rs. 175$,and a pencil box is $Rs. 14$ more than the combined price of one pen and one packet of wax colours. How much amount did Seema pay to the shopkeeper? (in $Rs.$)