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What is the role of ADH in the regulation of water in the body (osmoregulation)?

ADH (anti-diuretic hormone) is released by the pituitary gland in the brain. Differing amounts of ADH are secreted by the pituitary gland depending on the concentration of water in the blood plasma, which is...
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Answered by Laura M. • Biology tutor
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If y = 1/x^3, find an expression for dy/dx

Write down y = 1/x 3 This can be rewritten as y = 1x -3 or just y = x -3 as if the x is on the bottom of the fraction, it can be rewritten with a negative version of the power 3. A simple way of working this...
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Answered by Pete B. • Maths tutor
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Prove the identity (sin2x)/(1+(tanx)^2) = 2sinx(cosx)^3

For a proof like this, I like to start with the more difficult-looking side, and aim to end up with the expression on the other side. Starting with the left hand side, the first thing to change is the sin2x,...
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Answered by Alice C. • Maths tutor
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Consider and evaluate the ways in which Sylvia Plath, in her poem 'Nick and the Candlestick' (1962) presents an individual who is motivated by selfishness.

Sylvia Plath in her poem ‘Nick and the Candlestick’ (1962) presents an individual motivated by selfishness, someone who relies on their new born baby to meet their personal needs. For example, in the poem Pl...
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Solve for x in the following equation: e^x + 10e^(-x) = 7

First of all, we bring the 7 to the left side of the equation to get: e x -7+10e -x =0. Then, by multiplying both sides of the equation by e x , we can get an equation in the form of a quadratic equation: e ...
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Answered by Leonardo B. • Maths tutor
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