exam Maths Puzzle Numerical Ability

Factor completely. 12x^3 – 3xy^2 I got 3x(4x – y)(x + y) Is this correct

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exam Other Question

A BACTERIA CULTURE STARTED WITH A COUNT OF 480 AT 8:00 A.M. AND AFTER t HOURS IS EXPECTED TO GROW TO f(t)=480(3/2)t. ESTIMATE THE NUMBER OF BACTERIA IN THE CULTURE AT NOON THE SAME DAYS. Find the product or quotient

32. -12(11/20)

Any help with this equation would be Greatly</b> appreciated.