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The rate of decay of the mass is modelled by the differential equation dx/dt = -(5/2)x. Given that x = 60 when t = 0, solve the quation for x in terms of t.

(1) Rearrange the equation so that the left hand side is a function of x, and the right hand side is a function of t only.dx/dt = - (5/2) x(1/x)dx = -(5/2)dt(2) Integrate both sidesln(x/A) = -(5/2)t, wher...

Answered by Joseph C. • Maths tutor

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How should I approach analysing an unseen poem in an exam?

Having to write a whole essay on a poem you've never seen before can seem daunting, particularly as you only have five to ten minutes to read and understand it as well as planning your answer. However, th...

Answered by Emma C. • English Literature tutor

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Solve x^2 - 9 = 4x + 12

x² - 9 = 4x + 12 x² - 9 - 4x = 12 x² - 9 - 4x -12 = 0 x²- 4x -21 = 0 Factorise into form (x + ?)(x + ?) Factors of -21 ar...

Answered by Kira P. • Maths tutor

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Present the aims of a political or environmental movement in Modern Standard Arabic

موضوعنا هو ما يسمى بالإنجليزية 'ريوايلدينغ' العملية التي تهدف إلى إعادة الطبيعة أو أجزاء من العالم الطبيعي إلى حالة ما كانت عليها قبل تاريخ. وقد أثارت الحركة جدلاً واسع النطاق لا سيما في أوروبا لسبب بسيط ...

Answered by Jacob B. • Arabic tutor

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