exam Maths Puzzle Numerical Ability

i dont know where this question should be posted Q. A certain isotope has a decay rate of-1.5% find its half life
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exam Other Question
Use the quadratic formula to solve the equation for (a) x in terms of y and (b)y in terms of x.

1)4x^2-4sy+1-y^2=0



2)2x^2-xy=3y^2+1 Twice the area of a square is 72 miles. What is the length of each side of the square?