book Maths Puzzle Numerical Ability

solve "d"
16^(d-4) = 3^(3-d)

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book Other Question

Given the quadratic function f(x)=2x^2-8x-3 Find the following: a) the location of the vertex, b) the x-intercepts, if they exist c)the y-intercept, and d) graph. the perimeter of a rectangle is 160 ft. One fourth the length is the same as twice the width. Find the dimensions of the rectangle.