Help with math problem please?

The period of a pedulum is the time it takes for it to swing from one extreme to the other and back to its starting point again. The value of P in seconds is given by P=k*√1/g where 1 is the length of the pendulum, g is the acceleration due to gravity, and k is the constant. Find the constant k if Mallory's marvelous measurements determine that P=6,1=12, and g=32