For the 1st one:
x/72=50/100 x=36
2nd one:
x/108=125/100
100x=13500
x=135
it would be 81, all interior angles should equal 360 and that goes for any closed shape.
The formula for area is A = L*W or we can say A=LW. Lets plugin what we know.
A = LW
8 = 4W
Now solve for W
8 = LW
8=LW
8/4 = 4W / 4
2 = W
W = 2
So the width is 2ft
Austin should pay $75 the first month, and 37.50 for the remaining of the 2 months
For a width of 25, the length will also be 25, so the area is 25² = ...
625.
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The rule is
area = width×(50 -width)
