PAHELP ASAP PLS plsslsplspslsls

Answer:
1.False
2.True
3.False
4.False
5.True
6.B
7.C
8.A
9.E
10.D
11.C.triangle
12.A.vertex
13.B.pyramid
14.C.quadrilateral
15.B.sphere
16.B.coefficient
17.A.-8
18.B. ( b-a )+8