I was wondering if I can get some help

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.