exam Maths Puzzle Numerical Ability

Please help me find the volume, to the nearest tenth, of a pyramid that is 6 feet tall and whose base is an equilateral triangle with sides each 10 feet long?

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exam Other Question

Solve the following using elimination:

y=-2x +5
3x-2y=4
determine the perpindicular distance between
a. the parellel planes: x+2y+3z+6=0 and x+2y+3z-6=0