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AQA PC4 2015 Q5 // A) Find the gradient at P. B) Find the equation of the normal to the curve at P C)The normal P intersects at the curve again at the point Q(cos2q, sin q) Hence find the x-coordinate of Q.

A) We need to find dy/dx. We know that dy/dx =(dy/dt)/(dx/dt). Differentiating each parametric equation we get: dx/dt= -2sin(2t) {using the chain rule and knowing that cos differentiates to -sin.} dy/dt= cos...
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Answered by Tutor68191 D. • Maths tutor
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How does Shakespeare's presentation of the island and its atmosphere in "The Tempest" allow for the exploration of moral and psychological issues?

The moral and psychological issues which imbue the island in “The Tempest” are exemplified by the attitudes expressed toward the island by the play’s characters. Following the storm and shipwreck of Act One ...
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Ian's commute to work is 5km. He needs to be there by 9.00am. He travels at 10 km/h, what time does he need to leave home?

Answer is 8.30am Using the speed = distance/time reference the student would do distance/speed or 5/10 = 0.5 hours
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Answered by Isabelle F. • Maths tutor
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Identify two descriptive statistics and explain how the descriptive statistics you have identified could be calculated (4 marks)

The mean is one kind of descriptive statistic, it is calculated by adding up all of the individual scores and dividing by the total number of scores The median is a second kind of descriptive statistic, it i...
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Answered by Bethan W. • Psychology tutor
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Explain one strength of the Working Memory Model (3 marks)

There is clinical evidece to support the WMM from Shallice and Warrington's case study of patient KF (1970). KF had suffred some severe brain damage resulting in his loss of short term memory abilities. Howe...
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Answered by Bethan W. • Psychology tutor
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