exam Maths Puzzle Numerical Ability

Find the range for the following set of numbers.
-2 5/2,3 7/3,- 4

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exam Other Question

Let me try this again
+ and - radicals

3 sqrt 2y^3 - 5y sqrt 2y + 12 sqrt 8y^3
=3*2y sqrt y - 5y*2y + 12 * sqrt 2*2*2*y*y*y
= 6y sqrt y - 10y + 12*2y sqrt 2y
= 4y sqrt y + 24 sqrt 2 y In the figure below, points C, D, and F are collinear, ACF and CDE are equilateral traingles, and b +d= 90 degrees. Use a two column proof to prove that ABC is a right triangle.