exam Maths Puzzle Numerical Ability

What makes a number real, whole,natural, interger, irratiional, rational?

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exam Other Question

Which of the following expressions represents the product of 3 less than twice x and 2 more than the quanity 3 times x?

A. -6xsquared + 25x + 6
B. 6xsquared + 5x + 6
C. 6xsquared - 5x + 6
D. 6xsquared - 5x -6
E. 6xsquared - 13x - 6 The expression (1+cosx)(1-cosx)is equivalent to