exam Maths Puzzle Numerical Ability

Factor completely.
3x^2 - 23x + 40

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exam Other Question

[(5+4)x3] x 2 = 9 x(3x2)

is this associative law of multiplication?

it looks like we are doing (a x b) x c = a x (b x c)
Give an example of a number that is a rational number, but not an integer.