exam Maths Puzzle Numerical Ability

PROBLEM: THE QUANTITY y VARIES AS x AND INVERSELY AS z. IF y=15 WHEN x= 50 AND z= 10, FIND y WHEN x= 65 AND z= 5........

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3x^2-2x+1=0 1. Evaluate the function: F(x)=(2-x)/x+4 at the point x=-3.

2. Find the equation of the vertical line through the point (2,-1)