exam Maths Puzzle Numerical Ability

(-x + 2 / 3) - (2x + 5 / 4 ) = 5

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exam Other Question

Tell whether or not (-1,-5) is a solution of the system of inequalities

x + 2y < -12

and

3x - y > or equal to -2
The distance d in miles that can be seen on the surface of the ocean is given by d=1.3√(h,) where h is the height in feet above the surface. How high (to the nearest foot) would a platform have to see a distance of 13.5 miles?