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What is a derivative and how do we calculate it from first principles?

A derivative, in essence, is the gradient of a function at a point, usually denoted by dy/dx, or f'(x). It essentially means the rate of change of y with respect to x. As many functions are complex, we can n...
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Answered by Tom M. • Maths tutor
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Explain what is meant by the term 'correlation coefficient' ?

A correlation coefficient is a value between -1 and =1 which indicates the direction and strength of a relationship between two variables. As you may already know, correlations only depict a relationship bet...
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Answered by Sophia D. • Psychology tutor
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Evaluate the effect of UK inflation on a niche clothing boutique in UK.

Inflation can be described as the constant tendency for price levels to rise in an economy. There are many factors involved which determine the overall effect of inflation on a business. Firstly, an increase...
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Answered by Sakina T. • Economics tutor
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Expand and simplify (n + 2)^3 − n^3.

Expand and simplify ( n + 2) 3 − n 3 . Write out the brackets in full:( n + 2)( n + 2)( n + 2) − n 3 Use F.O.I.L. (First, Outer, Inner, Last) on first two sets of brackets:( n 2 + 2 n + 2 n + 4)( n + 2) - n ...
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Answered by Dominic C. • Maths tutor
5791 Views

Translate into French: My credit card was hacked last week, so I am reluctant to give out my bank information.

Ma carte bleue a été piratée la semaine dernière alors j’hésite à donner mes coordonnées bancaires
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Answered by Morgaine O. • French tutor
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