Evaluate the expression using logarithms. Round to the nearest tenth.4.7 
A. 18,343.5
B. 4.1
C. 38.0
D. 1.6
Answer: C
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Find the area of the specified region.Inside the circle r = -8 cos ? and outside the circle r = 4
A. 8?
B. 
?
C. 
(2? + 3
)
D. 
(4? - 3
)
Solve the problem.Mardi received an inheritance of 
. She invested part at 12% and deposited the remainder in tax-free bonds at 9%. Her total annual income from the investments was 
. Find the amount invested at 12%.
A. $40,000 B. $20,000 C. $39,000 D. $44,300
Solve the problem.Beaufort Canal has a semi-elliptical cross section with a width W = 97 feet and a depth D = 13 feet (see figure). The keel on Sasha's yacht rides 4 feet below the water line at the keel's deepest point. If the yacht travels parallel to the canal, and assuming the canal is completely full of water, how close can Sasha bring the yacht's centerline to the edge of the canal without running aground? (The keel is the very bottom of a boat hull and runs directly below the boat's centerline from front to back.)
A. 4 ft B. 3 ft C. 10 ft D. 38 ft
Determine the vertex, focus, and directrix of the parabola and sketch its graph.x2 = -16y
A. vertex: (0, 0)
focus: (-4, 0)
directrix: x = 4
B. vertex: (0, 0)
focus: (0, -4)
directrix: y = 4
C. vertex: (0, 0)
focus: (0, 4)
directrix: y = -4
D. vertex: (0, 0)
focus: (4, 0)
directrix: x = -4