exam Maths Puzzle Numerical Ability

State whether each is linear

A)f(x)=100x-37 B)xy-60=0

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Find the focus and the directrix of the parabola 16x^2 = y.
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In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be
engaged in safety and security-related jobs, and found that 1,143 were positive. (a) C