exam Maths Puzzle Numerical Ability

How many real roots and or imaginary roots does the following equation have:

x^2 - 625 = 0

Thanks

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exam Other Question

find an equation for the inverse relation:

y=-2x+5
Can you help me solve: The speed of an object falling from rest in a vacuum in directly proportional to the time it has fallen. After an object has fallen for 1.5 s, its speed is