exam Maths Puzzle Numerical Ability

[3(4-9)-2]-[6-(4-3)]=

Can some body please help me with this problem. I do not understand at all.

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exam Other Question

1. Find the slope of the line that passes through the points (-4, 1) and (3, 8).
I need your help I will appreciate it.
The Great Pyramid of Giza in Cairo,Egypt is a square pyramid. Each edge of the base is 751 feet and the slant height of each face is 610 feet. Find the approximate surface area of the pyramid.