Let's see what to do buddy...
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The sum of the angles of each n-sided figure is found in the following equation :

The question's figure is 5-sindes figure
so the sum the angles equal :

So we have :


Subtract the sides of the equation minus 479


And we're done.
Thanks for watching buddy good luck.
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All you do is move all the terms that don't contain " x " to the right side and solve.
x = 
Hope that helps, Good luck! (:
You would have to add a positive 6 to the negative 6 to get zero. Lets say you have -2 in order to get it to zero or just any positive number, you have to add a positive of the same value or higher to be able to get it there. I hope you understand that.
Yes because when your multiply every thing together you’ll have 9/15 miles
The length of DE is 3 bc they are dilated at a ratio of 1 : 1.5