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How can urine be used to detect pregnancy?

The hormone Human Chorionic Gonadotrophin (HCG) starts to be secreted six days after conception from a developing embryo. A pregnancy test stick has three bands. In the first are monoclonal antibodies which ...
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Answered by Aimee W. • Biology tutor
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How successful was the emancipation of the serfs in Russia under Alexander II?

In spite of of the Tsar’s reformist intentions, the emancipation of the serfs starting in 1861 produced largely negative effects. Intended to improve the social conditions of peasants and to spur an improvem...
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Answered by Sam P. • History tutor
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If y = exp(x^2), find dy/dx

Recall that the derivative of exp(x) is exp(x), but notice this question is slightly more complex due to the x^2 term. This is example of differentiationg composite functions, and so the chain rule is requir...
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Answered by Stuart B. • Maths tutor
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What is the perimeter and area of a rectangle with a length of 8cm and width of 3cm?

The perimeter is the distance around the rectangle. A rectangle has 4 sides: 2 of them will be the length (8cm) and 2 of them the width (3cm). To get the perimeter, you add up 2 of the length and 2 of the wi...
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Answered by Emma L. • Maths tutor
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Solve this equation: 3x-10=12x-7

Firstly, get all of the x's onto one side of the equation and all of the numbers onto the other. To make it easier at the end, subtract the smaller value of x so that it doesn't become negative: 3x-10=12x-7 ...
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Answered by Emma L. • Maths tutor
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