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.
This price variation can be significant, regardless of manufacturer. A plain front entry door starts at about $50-$250, depending on size and materials, or $200-$700 with installation. More decorative and durable mid-range front doors can cost $200-$2,000, or $400-$3,000 with installation.