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Factorise: 3x^2 - 9x - 30

The first think you can do is look to see if all of your terms can be divided by a common factor. In this case it is 3, leaving you with 3(x^2 - 3x - 10). This can be factorised further to produce something ...
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Answered by Freya N. • Maths tutor
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To what extent did the failure of collective security result in the policy of appeasement in the mid 1930s?

The League of Nations was set up following World War One in 1920 with a goal of maintaining peace. The League pursued a policy of Collective Security, which revolved around the idea that war should not be us...
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Answered by Caroline R. • History tutor
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Explain how longshore drift can transport sediment along a shoreline

Longshore drift is the movement of sediment along a shoreline due to a prevailing wind. The swash of waves runs up the beach and transports sediment at the angle of the wind. The backwash transports sediment...
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Answered by Daniel N. • Geography tutor
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What makes the structure of Haemoglobin good for the transport of oxygen to tissues? (3 marks)

Haemoglobin (Hb) is comprised of 4 polypeptide chains (2 alpha, 2 beta). Each polypeptide chain has a prosthetic group capable of picking up oxygen, therefore one Hb molecule can transport 4 oxygen molecules...
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A curve has the equation y=7-2x^5, find dy/dx of this curve

When you differentiate with respect to x, dy/dx, you multiply the number in front of the x by the power of the x then you take one away from the power.So for this example, the 2x 5 differentiates to:(2x5)x (...
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Answered by Emily C. • Maths tutor
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