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By using the substitution x = tan(u), find the integral of [1 / (x^2+1) dx] between the limits 1 and 0

First we need to change the limits, and by plugging in 1 and 0 to our substitution we find that the limits for u are arctan(1) and arctan(0) (or pi/4 and 0). Then we need to substitute for dx, and by differe...
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Answered by Ollie W. • Maths tutor
12719 Views

Which element, Na or Mg is likely to have the higher melting point? Give reasons for your choice

Sodium and Magnesium are both metals, when they are solid they form a metallic lattice held together by the electrostatic force of attractive between the positive metal ions, and the negative delocalised ele...
MP
Answered by Monique P. • Chemistry tutor
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Solve the equation (2X + 3) / (X-4) - (2X - 8) / (2X + 1) = 1

In order to solve this equation we need to find a common denominator for the 2 fractions. It is impossible to name the common denominator while working with unknown variables such as x,y etc. but we know fro...
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Answered by Octavian G. • Maths tutor
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"Deontological ethical systems are better at moral problem solving than Teleological ethical systems" Do you agree?

To answer this question we must first define what is meant by 'better'. Better I take to mean that system which solves a moral problem with ease, lack of confusion and accuracy. That said, it solves the mora...
JM
2755 Views

Tell me the different endings for regular -er, -ir and -re verbs (complete the text)

-ER verbs: je: …-e tu: …-es il/elle/on: …-e nous: …-ons vous: …-ez ils/elles: …-ent -IR verbs: je: …-is tu: …-is il/elle/on: …-it nous: …-issons vous: …-issez ils/elles: …-issent -RE verbs: je: …-s tu: …-s i...
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Answered by Molly R. • French tutor
3154 Views