The currrent, I0 (measured in amperes), decreases to I amperes after t seconds according to the formula I = I0e−0.51t. When 8 amperes decreases to 3.2 amperes, the equation is 3.2 = 8e−0.51t. Rounded to the nearest tenth of a second, how long, t, does it take for the current to decrease from 8 amps to 3.2 amps?

A. t = 0.4 second

B.t = 1.8 seconds

C. t = 2.5 seconds

D.t = 0.7 second

melissachery45
Oct 21, 2017