39 .
Figure 9
In Figure 9, C is the center of the semicircle, and the area of the semicircle is 8π. What is
the area of triangle ABC in terms of θ?
(A) 2 sin θ tan θ
(B) 4 sin θ
(C) 8 cos θ
(D) 8 sin θ
(E) 8 sin θ tan θ
40 . Exactly 70 percent of the people in each of 3 rooms are seniors at university X. If one
person is selected at random from each of the 3 rooms, what is the probability that each
of the 3 people selected is a senior at university X?
(A) 0.2401
(B) 0.343
(C) 0.49
(D) 0.64
(E) 0.7
41 . What is the value of x if 4.18x = 36.54?