exam Maths Puzzle Numerical Ability

Find the perimeter of a square whose diagonal measures 12in.

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How do I figure out what the domain and rande of something is that is (-7,4) and the vertex is -5? A motorboat travels 120km upstream and then 120km downstream in a total of seven hours. If the speed of the river's current is 5km/h,then what is the speed of the motorboat in stil