Blood urea nitrogen (BUN) is a measure of the amount of urea in the blood (R). It provides useful information about your health. The liver produces urea as a waste product of the digestion of proteins (R, R). Urea is a safe vehicle to get rid of excess nitrogen from the body.
Algebra is a branch of mathematics that substitutes letters for numbers, and an algebraic equation represents a scale where what is done on one side of the scale is also done to the other side of the scale and the numbers act as constants.
Math is like a pyramid. Every new skill requires an understanding of prerequisites to do well. 1 + 5 or 24 + 50. By the same token, before learning pre-algebra, a good understanding of basic mathematics is important. And before learning algebra, a solid understanding of pre-algebra is a must. My goal and also my desire is to teach you math, but above all I want to teach you to be free and to be your best teacher. You will notice that when I teach a lesson, I explain a lot. I do this to give you a deep understanding of basic mathematics and algebra.