1.
10.
square units
2.
11.
3.
12.
4.
5
13.
(a,b,c,d,e,f,g,h) = (7,-11,-2,-2,-2,-2,-11,7)
and
(a,b,c,d,e,f,g,h) = (-2,-2,7,-11,-11,7,-2,-2)
5.
5050
14.
inches
6.
square units
15.
7.
16.
8 square units
(the area is independent of x)
8.
17.
11,520
9.
18.
square units