Itâs a cost-benefit analysis: If it costs you 3 hours weekly to do the wash, but costs you $30 to send it out â that is $10 per hour. But if you bill more than that at your business â or stand to get a raise if you use those three hours to learn new skills, earn a degree, etc., it is worth the investment.
Coordinate Rules for Rotations. In general, we can state the following coordinate rules for (counterclockwise) rotations about the origin: For a rotation of 90o: (x, y) --> (ây, x) For a rotation of 180o: (x, y) --> (âx, ây) For a rotation of 270o: (x, y) --> (y, âx)
Example: Plot (x-4) 2 + (y-2) 2 = 25. The formula for a circle is (x-a) 2 + (y-b) 2 = r 2. So the center is at (4,2) And r 2 is 25, so the radius is â25 = 5. So we can plot: The Center: (4,2) Up: (4,2+5) = (4,7) Down: (4,2-5) = (4,-3) Left: (4-5,2) = (-1,2) Right: (4+5,2) = (9,2)