book Maths Puzzle Numerical Ability

The period of a simple pendulum is directly proportional to the
square root of its length. If a pendulum has a length of 6 feet and a
period of 2 seconds, to what length should it be shortened to achieve
a 1 second period?

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book Other Question
Fill in the blanks:

_ _ - ( _ / _ ) =9

the only numbers you can use are 3, 4, 6, 8, and 9

the same goes for this problem:

_ _ / _ + _ _ = 418 Is negative four to the negative one power gaoing to give me a positive four?