If you graph a linear function, you get a line. If you graph a quadratic function, you get something called a parabola. A parabola tends to look like a smile or a frown, depending on the function. Check out this tutorial and learn about parabolas!
Orange Door Meanings. Orange is a colour associated with Mercury, which is the swiftest of the planets. Indeed the planet as the fleet-footed Roman god is symbolic of for reception, communication, perception, commerce, movement, intelligence and flexibility. With these kind of qualities, it might be a good idea to paint your business door orange.
The average cost to paint a front door ranges from $100 - $300 per door. Do not use paint intended for interior doors on your exterior door. While interior paint is strong, it cannot handle outdoor climate conditions. The best paint to use on exterior doors is 100 percent acrylic latex paint.