Answer
=$3.75$
Work Step by Step
$\int_{-1}^{2}$ $x^{3} dx$
=$\frac{x^4}{4}$| $_{-1}^{2}$
=[$\frac{2^4}{4}$] - [$\frac{-1^4}{4}$]
=[$\frac{16}{4}$] - [$\frac{1}{4}$]
=$\frac{15}{4}$
=$3.75$
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