book Maths Puzzle Numerical Ability

Find the distance between (3,-1)and (-1,2) thank you

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book Other Question

A public safety department for a local community employs 23 officers of which 5 are sergeants. Due to the size of the community, 3 of the officers on duty at any given time must b Two angles are supplementary. The measure of the second angle is 45 degrees less than two times the measure of the first angle. Find the measure of each angle.

Please show me the formula and the steps to answer it correctly

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