I have a question (I understood 41 but I don't understand the others) about the following problem. I have attached the question, the given answer, and the work I did. Thank you so much!

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

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.