The length (in mm) of the mesiodistal crown of the first molar for human fetuses can be approximated by L(t) = -0.01t² + 0.788t - 7.048, where t is the number of weeks since conception.
(a) What does this formula predict for the length at 14 weeks? 24 weeks?

(b) What does this formula predict for the maximum length, and when does that occur? Explain why the formula does not make sense past that time.