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(D) The area $A$ of the region bounded by the curve $y=f(x)$,the $x$-axis,and the lines $x=a$ and $x=b$ is given by $A = \int_{a}^{b} f(x) dx$. Here,$

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$10$ sq units

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(D) The area $A$ of the region bounded by the curve $y=f(x)$,the $x$-axis,and the lines $x=a$ and $x=b$ is given by $A = \int_{a}^{b} f(x) dx$. Here,$f(x) = x+1$,$a=3$,and $b=5$. $	herefore$ Required area,$A = \int_{3}^{5} (x+1) dx$ $= \left[ \frac{x^2}{2} + x ight]_{3}^{5}$ $= \left( \frac{5^2}{2} + 5 ight) - \left( \frac{3^2}{2} + 3 ight)$ $= \left( \frac{25}{2} + 5 ight) - \left( \frac{9}{2} + 3 ight)$ $= \left( \frac{25+10}{2} ight) - \left( \frac{9+6}{2} ight)$ $= \frac{35}{2} - \frac{15}{2}$ $= \frac{20}{2} = 10 	ext{ sq units}$.

The area of the region bounded by the line $y=x+1$ and the lines $x=3$ and $x=5$ is

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