need typed answer

13) The time constant for an RC :ircuit is the amount of time it takes the capacitar to gain 63.2% of its :harge [charging] cur lose 63.2% of its charge (diszharging). It is also equal to the time it takes the current to fall by 612% in an RC circuit. Using this information, find the value for C, the capacitance of the capacitor. a) bl Explain how you cakuiated the above