exam Maths Puzzle Numerical Ability

Factor these ?

4x^2 -12x -40

2x^2 -16x +30

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exam Other Question

A rectangular solid has a base with length 10 cm and width 9 cm. If the volume of the solid is 270 cm3, find the height of the solid. (Hint: The volume of a rectangular solid is given by V = LWH.)

Confuse on cm3...need help in solving...thanks. |x-y|+6(4x-|-6+y|) when x=-2 and y=3/2