Question

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Answer 1

dot product of (3,-1) and (1,5):
multiply the x's, multiply the y's, add them.

Answer 2

dot product of (x1, y1) and (x2, y2) = x1 * x2 + y1 * y2

Answer 3

yes.

Answer 4

= -2

Answer 5

IF the dot product of two vectors is ZERO, it means the two vectors are perpendicular to each other. Another name for perpendicular is orthogonal.

So if the dot product of two vectors is non-zero it means ...

Answer 6

Magnitude of (x1, y1) = sqrt(x1^2 + y1^2)

Answer 7

No. If zero implies they are perpendicular to each other, then Non-zero implies they are NOT perpendicular to each other.

Answer 8

\[\Large \sqrt{20} = \sqrt{4 * 5} = 2\sqrt{5}\]

Answer 9

yw.