Answer
$8$
Work Step by Step
Consider $\iint_{R} f(u,v) dA= \int_{-2}^{0} \int_v^{-v} 2 dp dv= \int_{-2}^{0} [2p]_{v}^{-v} dv$
or, $= \int_{-2}^{0} -2v-2v dv$
or, $= [-2v^2]_{-2}^{0}$
Thus, we have $I=2\times (-2)^2 =8$
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