A schematic of a simple electrical circuit consisting of a resistor and an inductor is shown in the figure. The current I at time t is given by the formula
I = 25e^(−Rt/L), where R is the resistance and L is the inductance. Solve this equation for t
I = 25e^(−Rt/L)
I/25 =e^(−Rt/L)
ln(I/25) = -Rt/L
now just finish it off.
Too bad the font makes things confusing.