Recent content by Yohan Lee

  1. Y

    How Long Until Superman Regains His Powers?

    Thank you i got 0.1Q=Qe^(-0.138629t) t= 16.6
  2. Y

    How Long Until Superman Regains His Powers?

    Homework Statement superman has been disabled by a nearby amount of kryptonite, which decays exponentially. If Superman cannot regain his power until 90% og the kryptonite disintegrates, then how long will it be before he regain his powers? Use r=-0.138629. Round to the nearest day. a. 4days...