It should be -3 I hope this helps
Perimeter = namely the length of outside bordering,
well, this is a PENTAgon, or PENTA=5 or namely 5 sides, is regular so each side is the same length, so we have a polygon with 5 sides each measuring 40cm, well, its perimeter is just 40+40+40+40+40 = 200.
I think that inches would be most common for height but centimeters and feet could also be used.
The last one, v = -2,000y + 20,000
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