Question

s(t)=68-20log(t+1),t>0

Answer 1

what is the actual question?

Answer 2

If you are trying to graph this, notice if t=0 then s(0) = 68
As t increases, log(t+1) increases resulting in s(t) to decrease indefinitely
to find x-intercept, set s(t) = 0, solve for t
20log(t+1) = 68
log(t+1) = 3.4 (I will assume this is natural log)
t+1 = e^3.4
t = 28.96