Mario’s company makes unusually shaped imitation gemstones. one gemstone has 14 faces and 10 vertices. how many edges does the gemstone have?  

The gemstone has 22 edges.

We use Euler's formula on this:

F + V - E = 2

Substituting our information, we have:

14 + 10 - E = 2

Combining like terms, 
24 - E = 2

Subtract 24 from both sides:
24 - E - 24 = 2 - 24
-E = -22

Divide both sides by -1:
-E/-1 = -22/-1
E = 22

The correct graph is the second one, with the points being at (-6,0), (2,0) and reaching down to (-2,-8)

The answer is 225 miles per 4.5 hours. hope this ; )