exam Maths Puzzle Numerical Ability

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Find the slope of any line parallel to the line through points (18,2)and (3,3).

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exam Other Question

IF A ROCK IS DROPPED FROM A CLIFF INTO AN OCEAN, IT TRAVELS APPROXIMATELY 16t SQUARED FEET IN t SECONDS. IF THE SPLASH IS HEARD 4 SECONDS LATER AND THE SPEED OF SOUND IS 1,100 FT/SEC, APPROXIMATE THE HEIGHT OF THE CLIFF. graph f(x)=-x^2+3x+2 and find the vertex.