Give the exact value for tan 13pi/3

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

Explain why the rate of urbanisation is in the way it is between developed and undeveloped countries.

If you were a casual recreational hiker with young children, which of the following trails would be least strenuous for a leisurely family outing? a. merced lake trail b. mirror lake loop trail. c. tenaya lake and tuolumne meadows trail d. el capitan trail