Answer:
B. A sample in which the subjects themselves decide whether to be included in the study.
Step-by-step explanation:
In other words a voluntary response sample is a sample made up of volunteers o people who choose to be inlcuded.
Find the missing angles using either the triangle sum theorem (a2+b2=c2) or inverse trigonometric ratios
V=LWH, W=L-3, H=5, V=270
L(L-3)5=270
5L^2-15L=270
5L^2-15L-270=0
L^2-3L-54=0
L^2+6L-9L-54=0
L(L+6)-9(L-6)=0
(L-9)(L+6)=0
Since L>0
L=9 meters
