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Explain two ways in which the human body reacts to an increase in body temperature above the optimum.

Firstly sweat is released from sweat glands onto the surface of our skin. This acts to decrease body temperature by causing thermal engery to be transfered away from the skin as the sweat evaporates. Secondl...
MS
Answered by Max S. • Biology tutor
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Solve x^2+8x-5 = 0 by completing the square.

x 2 + 8x = (x + 4) 2 - 16, so x 2 + 8x - 5 = (x + 4) 2 - 16 - 5 = (x + 4) 2 - 21, so then (x + 4) 2 - 21 = 0 (x + 4) 2 = 21 -----> x + 4 = √21 -------> x = -4 + √21 x = -4 - √21
SJ
Answered by Shadab J. • Maths tutor
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How do I begin analysing the unseen poem during the exam?

The idea of an unseen poem in an exam setting can be extremely unnerving- but if you set yourself up to feel comfortable reading and analysing poems you haven't studied before, you will have the tools to pic...
HP
Answered by Hannie P. • English tutor
6227 Views

Differentiate artanh(x) with respect to x

First we set y=artanh(x). Then we rearrange such that tanh(y)=x. There several approaches to find dy/dx, but the quickest is to use implicit differentiation. The differential of tanh(y) is sech 2 y. We diffe...
SH
14306 Views

titration calculation: 35cm3 of Hydrochloric Acid reacts with 27.5cm3, 0.3mol/dm3 NaOH. What is the Concentration of the Hydrochloric Acid?

Write out what you know: HCL - VOL: 35 --- CONC: (x) --- MOL: (x) NaOH - VOL: 27.5 --- CONC: 0.3 --- MOL: (x) Realise what you can work out - Mol of NaOH in this case Mol = Conc x (Vol/1000) so Mol = 0.3 x (...
GK
Answered by Ghazn K. • Chemistry tutor
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