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.
The order of operations in algebra is important if you want to find the correct answer. You first work through any grouping symbols, then exponents or roots, then multiplication, division, addition, and finally subtraction. Practice following the order of operations by solving this example problem: