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avoli are small chambers that branvh off from the bronchioles in the lungs, and is where gas exchange directly occurs. these have quite an ireegular shape and contain many fold in its structure, this allo...

With equations like this the most important thing is that you end up with all the numbers on one hand side and all the letters on the other side. People often think there is a 'right' and 'wrong' order to...

1. The number 'in front of' an unknown is called the Coefficient. When eliminating an unknown, look to see whether the coefficients of x are the same in both equations, or if the coefficients of y are ...

Alike atoms, protons are also made of smaller particles - mesons. When protons are at very close distance mesons are bonded together by the Strong Nuclear Force, which is stronger than the Electric Force,...

completing the square: (x+2)^2-9 finding the roots: (x+2)^2=9 x+2=+/-3 at y= 0, x= -5 or 1