exam Maths Puzzle Numerical Ability

Trying to help my daughter...I do not understand what they mean by take the inverse...I know how to set up the matrix

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exam Other Question

use property 1 to simplify the following radical expressions. assume that all variables represent positive real numbers

/72x^3
A rectangle is drawn on a coordinate plane so that three vertices are located at these coordinates: (-5, 2), (5, 2), and (-5, -3) What are the coordinates of the fourth vertex of the rectangle?