In Figure 3. Triangle ABC is inscribed in a semicircle. If BD=6 and CD=4, what is the area of triangle ABC?
(A) 78
(B) 39
(C) 36
(D) 32
(E) 25
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Which two statements are true about a system? 1. a system is a group of objects analyzed as one unit. 2. energy that moves across system boundaries is conserved. 3. there’s only one way to define the boundaries of a system. 4. all systems are made by humans.

Mount saint helen the great lakes and death valley are physical features of the earth which scientific term describes these features

Rick is on a bicycle trip. every 4 days he bikes 230 km. if rick keeps this same pace for 16 days, how many kilometers will he bike?