Calculate the Double Integral $\iint _ { R } \frac { 1 + x } { 1 + y } d A$

Short Answer

Calculate the double integral $\iint _ { R } \frac { 1 + x } { 1 + y } d A$ , where $R = \{ ( x , y ) \mid - 1 \leq x \leq 2,0 \leq y \leq 1 \}$ .