exam Maths Puzzle Numerical Ability

Find a slope of a line perpendicular to each given line.
0=3+x
-3y=12x+9

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exam Other Question

some bacteria were put in the microscope and doubles every 6 minutes. In 2 hours slide is fully covered. when was it fully covered? The kinetic energy of a particle of mass m is found by taking
one-half of the product of the mass (m) and the square of the velocity (v). Write
an expression for the kinetic energy of a particle.