exam Maths Puzzle Numerical Ability

3y2=5y-8=0 that should read 3y squared. I have to solve the equation(i.e. x=4 or 6)

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1) 5=|2x/7 + 4/7| -3 The intensity I of a television signal varies inversely as the square of the distance d from the transmitter. If the intensity is 25W/m^2 at a distance of 2km, what is the intensit