## Calculus 8th Edition

$14 \sqrt 3$
$|a|=7,|b|=4$ , $\theta =30^\circ$ Dot product formula: $a \cdot b=|a||b|cos \theta$ $a \cdot b=(7)(4)cos 30^\circ$ $a \cdot b=28(\frac{\sqrt 3}{2})$ $a \cdot b=14 \sqrt 3$