Answer
$33^{\circ}$
Work Step by Step
Let $\theta$ be the angle between the ladder and the wall.
Then, $\tan\theta=\frac{opposite\,side}{adjacent\,side}=\frac{4.5\,ft}{7.0\,ft}=0.64$
$\theta=\tan^{-1}(0.64)=33^{\circ}$
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