chemical kinetics question

thats it

2) For a first order reaction the concentration of the reactant A changes with time according to the following table: A)Find the rate constant k graphically? Prove your answer mathematically? B) Find the concentration of A at 100 s graphically? Prove your answer mathematically? 2) For a first order reaction the concentration of the reactant A changes with time according to the following table: A)Find the rate constant k graphically? Prove your answer mathematically? B) Find the concentration of A at 100s graphically? Prove your answer mathematically