exam Maths Puzzle Numerical Ability

Determine which two equations represent perpendicular lines.

(a)y=4/7x-3 (b) y=3x-4/7

(c) y=1/3x+4/7 (d) y=1/3x-4/7

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If the amount of mercury in a polluted lake is 0.40 HG/mL, what is the total mass of mercury in kilograms in the lake. The lake has a surface area of 25 square miles and an average x+3/4w / w-3/2w