The y value is 7, help me please

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

Ain is , is 's of ? 0.62 0.79 1.27 1.50

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?