The slope of this triangle is -2/1
Its not C
suck it
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X - <span>the cost of cell phone service before tax is added
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It's exactly 4 meters because the question is asking how far below is it from the surface of the water.
If it's a regular octahedron, then you can calculate it using the formula

where

is the length of the edge.
If it's not regular, you have to calculate the area of each side individually.