0.75^(x+1) = 20
Lei's take the log of both sides...so we have
log .75^(x+1) = log 20 and by a "log" property, we can write
(x + 1) log . 75 = log 20 divide both sides by log .75
x + 1 = log20 / log .75
x + 1 = -10.413 subtract 1 from both sides
x = -11.413
