The length (in mm) of the mesiodistal crown of the first molar for human fetuses can be approximated by L(t)= -0.01t^2 + 0.776t - 6.643 Where (t) is the number of weeks since conception. 1) What does this formula predict for the maximum length of the crown of the first molar, and when does that occur? Round the answer to the nearest tenth. The maximum length of__________occurs at___________.         2) If the length of the mesiodistal crown is approximately 7 mm, how many weeks is the human fetus since conception? Round the answer to the nearest tenth.

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