exam Maths Puzzle Numerical Ability

Find f (-1/3). f(x)=18x2-12x-3

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Please help me with this word problem.

The base of a ladder is 14 feet away from the wall. The top of the ladder is 17 feet from the floor. Find the length of the ladder to the nearest thousandth.

Thank you! A jar contains 5 white, 7 blue, and 8 red marbles. If you remove 1 marble at a time, randomly, what is the minimum number that you must remove to be certain that you have at least 3 marbles of each color?