The "forgetting curve" for memorizing nonsense syllables is given by

\[R=80-27 \ln t(t \geq 1)\]

where \(R\) is the percentage who remember the syllables after \(t\) seconds.

a. In how many seconds would only \(10 \%(R=10)\) of the students remember?

b. Solve for \(t . \quad t=e^{(80-R) / 27}\)