Bob’s employer covers 23% of his family’s annual health insurance premium. the balance of the premium is deducted in equal amoun
1 answer:
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Answer:
38%
Step-by-step explanation:
Original price = $ 80
Price after reduction = $ 49.60
Reduction = 80 - 49.60 = $30.40
Percentage of decrease =
= 38%
<h3>Answer:</h3>
(x, y) ⇒ (-y, x)
<h3>Explanation:</h3>A point at y=1 on the y-axis will rotate to the point x = -1 on the x-axis when it is rotated 90° CCW about the origin. Hence the value of x for the image point is the opposite of the y-value of the original point.
A point at x=1 on the x-axis will rotate to the point y=1 on the y-axis when it is rotated 90° CCW about the origin. Hence the value of y for the image point is the x-value of the original point.
In summary, ...
... (x, y) ⇒ (-y, x)
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<em>Comment on rotation matrices</em>
The rotation matrix for rotatation through the angle θ CCW about the origin is ...
When θ = 90°, this matrix becomes ...
and multiplication by coordinates (x, y) gives ...