exam Maths Puzzle Numerical Ability

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

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Yuri has a board that is 98 inches long. He wishes to cut the board into two pieces so that the pieces will be 10 inches longer that the other. What should the lenght of each piece? Perform the indicated operation

(6x^2 + 7x - 8)-(-9x^2 + 10)

a)-3x^2 + 7x + 2 b)15x^2 + 7x - 18 c)15x^2 - 3x - 8 d)-3x^2 - 3x - 8