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Expand the following brackets: (2x + 1)(x + 3)

The FOIL technique (First, Outside, Inside, Last) is very useful when expanding out brackets. Using this method we have:2x * x = 2x 2 (First) 2x * 3 = 6x (Outside) 1 * x = x (Inside) 1 * 3 = 3 (Last)So overa...
BA
Answered by Ben A. • Maths tutor
4462 Views

Describe Christian attitudes to abortion.

Christian Teaching Roman Catholics and some Evangelical Christians believe that life begins at conception so abortion is murder and a serious sin.Christian teachings on the Sanctity of life means every human...
AS
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Solve the following system of simultaneous equations: y=x^2 - 5x + 4 ; x+2y=19

Sub y=x^2 - 5x + 4 into x+2y=19x+2(x^2 -5x + 4) = 19x + 2x^2 -10x + 8 =192x^2 - 9x -11 = 0 (2x -11)(x+1) = 0x= 5.5x=-1
SR
Answered by Sulamaan R. • Maths tutor
5120 Views

Describe how haemoglobin binds to oxygen:

The binding curve of haemoglobin to its substrate is sigmoidal ('s' -shaped). Haemoglobin has four subunits, each of which will bind one molecule of oxygen. The reason for the sigmoidal shape is the process ...
EB
Answered by Emma B. • Biology tutor
4327 Views

Explain how red blood cells are adapted to carry oxygen.

Firstly, red blood cells contain the globular protein haemoglobin which is able to bind reversibly with oxygen. This means red blood cells can take up and then release oxygen as they transport it around the ...
LC
Answered by Laura C. • Biology tutor
17166 Views