1.

`int_(1)^(4)xsqrt(x)dx=?`A. `12.8`B. `12.4`C. `7`D. none of these

Answer» `I=int_(1)^(4)x^(3//2)dx=[(2)/(3)x^(5//2)]_(1)^(4)=(62)/(5)=12.4`.


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