exam Maths Puzzle Numerical Ability

Use the square root property to solve the equation.
x^2=4

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exam Other Question

the fast freight train made the trip in 6 hours. The next day the slow freight train made the same trip in 8 hours. What was the speed of the slow freight train if the fast freight train traveled 20 mph faster than the slow freight train? What is the length of a side of a square if the area and perimeter are numerically equal?