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Heat the oil up until it is a vapour Pass into fractionating column Negative temperature gradientHydrocarbons of different lengths have different boiling points They condense at different heights and are ...

a)starting from ax²+bx+c=0, divide through by a, x²+(b/a)x+c/a=0, complete the square (x+(b/2a))²-(b/2a)² +c/a=0, expand (x+(b/2a))²-(b²/4...

Capillaries-one cell thick, minimal diffusion distanceveins-wise lumen, many elastic fibres, valves presentarteries-thick muscular layer to withstand BP

This would be regarded as a writing task. The student would need to apply the following grammar rules:
Correct use of case endings (where possible)Use of conjunctions / variety of conjunctionsUse of ...

To solve a question we want to get the x terms and one sides, the variables, and the numbers on the other side, the constants.7x + 6 > 1 + 2xSubtract 2x from 7x so we only have x terms on the left hand...