Skin tags that have changed color or bleed may require your doctor's evaluation and reassurance. Rarely, thrombosed skin tags may be a sign of another condition and need to be biopsied.
The x-axis and y-axis are two lines that create the coordinate plane. The x-axis is a horizontal line and the y-axis is a vertical line. I'm sure you've heard that a million times, but it might hard for you to remember which one is which. Here is a little trick to help you remember...
Posts: 3,791. Sounds like your doing calculus. Vertical motion model is just that, you want a mathimatical model of where an object will be, how fast it will be traveling, and how fast it will be accelerating, when it is falling, or possibly being propelled (although that is quite complex).