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\centerline
{
\bf ``QUIZ'' for Lecture 2
}
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{\bf NAME:} (print!) $\underline
{\quad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad}$
{\quad \bf Section:}
$\underline{\quad\quad\quad}$

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{\bf E-MAIL ADDRESS:} (print!) 
$\underline
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{\bf 1.} Determine whether the two vectors are orthogonal
and if not, whether the angle  between them is acute or obtuse.
${\bf a.} \quad \langle 1,1,1 \rangle \quad , \quad \langle 3,-2,-1 \rangle \quad .$

${\bf b.} \quad \quad \langle 4,3 \rangle \quad , \quad  \langle 2,-4 \rangle \quad .$

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{\bf 2.}  Calculate ${\bf v} \times {\bf w}$, \quad if
$$
{\bf v}= \langle 0,1, -1 \rangle \quad , \quad
{\bf w}= \langle 1,-1, 0 \rangle \quad .
$$

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