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The alveolus is the terminal component of the lung. The efficiency of gas exchange across its wall and into the blood is dependent on several factors including; adequate ventilation, adequate blood supply...

x^2 - 5x -14 = 0Factorise to give (x-7)(x+2)=0therefore x-7 = 0 OR x+2 = 0 so x = 7 or x = -2

First thing I like to do with questions like these is to check if I can simplify the expression given, and we can simplify this expression. So 4x^2+18x+2 can be simplified to 2x^2+9+1. The next step for m...

Structure - central nucleus of protons and neutrons orbited by electrons
Charge - proton = +1, neutron = 0 and electron = -1
Mass - number of protons + number of neutrons

2x^2 + 7x + 6 = 0
(2x + 3)(x + 2) = 0
2x +3 = 0 -> 2x = -3 -> x = -3/2
x + 2 = 0 -> x = -2
x = -3/2x = -2