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Solve the equations giving your answer in 2d.p (5 Marks).: x^2 + y^2 = 36 , x = 2y + 6

x 2 + y 2 = 36 (1) x = 2y + 6 (2) You can solve simulateous equations in three ways: Substitution, addition or subtraction. If one equation contains both x 2 and y 2 then you should use substitution as with ...
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Answered by Joseph P. • Maths tutor
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Take the square root of 2i

As with much of complex number the trick here is to change forms to polar representation.If you think of an argand diagram the number i will be represented as a point straight up on the imaginary axis a dist...
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Answered by Simon T. • Maths tutor
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Based on Newton's 3 laws of motion why is linear momentum always conserved?

This is a common IB question- fairly tricky the first time you com across it!
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Answered by Simon T. • Physics tutor
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What is meant by Parsons 'instrumental' and 'expressive' roles?

This is an important theory when looking at the domestic division of labour from a functionalist perspective. Parsons (1955) argues that in the nuclear family the husband and wife have different separate rol...
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Explain the trend in Ionisation energy when moving across a period and down a group

Key definitions/explanation of terms Ionisation energy is the energy required to r emove one mole of electrons from one mole of gaseous atoms to produce one mole of gaseous ions with a 1+ charge. Electron sh...
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Answered by Olivia F. • Chemistry tutor
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