exam Maths Puzzle Numerical Ability

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.

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exam Other Question
if f(x)=4x-3 find the following:
f(-1) "With the exception of 2 and 3, every prime number is a multiple of 6, add or take away 1. Is this true?"