Answer:
heres an example of substitution in a world problem. hope this helps on some other problens
How do I convert 2 months into years using 360 days?
1 answer:
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Answer: The correct answer is “this is a reflection across the x-axis”
I can't read that language but I'll guess it says write a second degree equation then solve for n when d=10.
Answer: n² - 3n - 20 = 0
That doesn't factor so there is no integer n solution.
That means there are no polygons with 10 diagonals.