exam Maths Puzzle Numerical Ability

Draw a line segment and a point outside the line. Construct a line through the point that is perpendicular to the segment.

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exam Other Question

2x+ 3y = 6 (for x)

D = c-s over n ( for s) Can someone help me here on this problem?

Jon spent 1/3 of his study time doing math homework and 2/7 preparing for a history exam.
What fraction of his study time remains?

Thanks, Lyn