## Thomas' Calculus 13th Edition

$47\frac{1}{16}$
Integrate with respect to x and plug in limits to evaluate: $=x^3-x^4/16$ with limits from 1 to 4 $=4^3-4^4/16-1^3+1^4/16=64-16-1+1/16=47\frac{1}{16}$