exam Maths Puzzle Numerical Ability

Simplify

Square root 7 (9 Square root 2 - 3 Square root 7)

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exam Other Question

Determine which two equations represent perpendicular lines.
(a) y = 6x - 6 (b) y = 1/6 x + 6
(c) y = -1/6 x + 6
(d) y =1/6 x - 6
a wire is bent in the form of a quadrant of a circle of diameter 1.4m. find the length of the wire, if the quadrant is bounded by the radii of the circle.