Alright well basically I've got 2 problems, haven't done algebra in a year, totally forgot how to do this stuff.

√x/y =4 , which of the following represents y in terms of x?

a. y = x/2

b. y = 2/x

c. y = x/16

d. y = 16/x

problem number 2

The forumla P = 2pi (√L/32) can be used to approximate the period of a pendulum,

Where L is the pendulum's length in feet and P is the pendulum's period in seconds. If a pendulum's period is 1.6 seconds, what is the length of the pendulum to 3 decimal places?

I'd appreciate explanation with the answer please, thank you.