book Maths Puzzle Numerical Ability

log2 x -log2 3=log 2(2x-5)

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book Other Question

graph y = 3 sin x and y = sin 3x on the same axes. label the graph of each function. The lenght of a rectangle is (3x) yards and its width is (x+2) yards. For what value of x will the perimeter of the rectangle be 40 yards.