The value of the integral

$$\int\!\!\!\int\limits_D {3({x^2} + {y^2})dx\,dy} $$,

where D is the shaded triangular region shown in the diagram, is ___________ (rounded off to the nearest integer).

The current I in the circuit shown is _________.

Consider the circuit shown in the figure. The current I flowing through the 10 $$\Omega$$ resister is ___________.

For the circuit shown, the locus of the impedance Z(j$$\omega$$) is plotted as $$\omega$$ increases from zero to infinity. The values of R₁ and R₂ are :