Pendulum problems (finding gravity and work)?

The period of a pendulum can be found using the equation, T=2(pi or 3.14 approximately) multiplied by the square root of the length of the pendulum divided by g, or acceleration due to gravity. In this problem, we know the length of the pendulum, 75.0, and the period (T), 2.8 s. Because we are looking for g, the equation must be rearranged. First, square all of the terms to get rid of the radical. The equation then becomes T squared= 4-pi-squared times L/g. Then, rearrange to end up with g= T squared/ 4-pi-squared. (The equation would have been much easier to write if the symbols were on my keyboard).