Question

if the area of a triangular prism is 300 and the height is 3 what is the area of the base?

Answer 1

The volume of any prism is given by
.. V = Bh . . . . B is the area of the base, h is the height

You have
.. 300 = B*3
.. 300/3 = B = 100

The area of the base is 100 square units.