exam Maths Puzzle Numerical Ability

6) A right triangle is a triangle with one angle measuring 90�. In a right triangle, the lengths of the sides are related by the Pythagorean Theorem, , where c is the length of th

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find the positive root of the equation 4x^2-36=0 Hi, I have to solve the following for t:

300=500(1-e^0.2t)
Assume that ln *0.4)= -0.9

I wouldnt even know where to start..all i can think to do is
300500=(1-e^0.2t)

any help would be very much appreciated! thanks