exam Maths Puzzle Numerical Ability

simplify
9 square root of 6-9 square root of 2

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exam Other Question

"In the triangle ABC, measure of angle A= 60 degrees and the measure of angel C = 80 degrees. The exterior angle at B measures(x+10).

What is the value of x?"
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The length of a rectangle is 1 cm more than 2 times its width. If the area of the rectangle is 76 cm^2, find the dimensions of the rectangle to the nearest thousandth.