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What was the most significant reason for the success of the First Crusade?

On July 15th 1099 Jerusalem, recently captured by the Fatimids of the Egyptian Sultan, Al-Musta'li, fell to the crusaders. With their victory, three years of campaign came to a victorious end; the assurances...
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Answered by Gareth C. • History tutor
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Describe the Cognitive Interview. (6 marks).

The cognitive interview is an interview technique used in order to aid memory and improve accuracy of eye witness statements. The interview consists of four aspects: 'recall everything', 'reverse the order',...
Answered by • Psychology tutor
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Explain the process of DNA Replication

DNA replication is semi-conservative; new DNA molecule is composed of 1 old strand of DNA and 1 new strand .Many enzymes are involved in this process. The action of these can be combined into a 7 step proces...
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Answered by Barbora H. • Biology tutor
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What are the 4 main factors of production?

These are the inputs available to supply goods and services in an economy. Remembered by the acronym CELL - Capital, Enterprise, Land and Labour
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Answered by Georgia N. • Economics tutor
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f ( x ) = 2 x ^3 − 5 x ^2 + ax + a. Given that (x + 2) is a factor of f ( x ), find the value of the constant a. (3 marker)

If x+2 is definitely a factor, that means when we sub x=-2 in, we should get 0 at the end. So 2(-2)^3 - 5(-2)^2 + a(-2) + a = 0So -16 -20= aso a = -36
Answered by • Maths tutor
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