Solve the problem.From a point on a river, two boats are driven in opposite directions, one at 8 miles per hour and the other at 5 miles per hour. In how many hours will they be 52 miles apart?
A. 1 hr
B. 6 hr
C. 4 hr
D. 5 hr
Answer: C
Mathematics
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Solve the problem.Find the center of mass of the region of constant density bounded by the paraboloid 
and the xy-plane.
A. 
= 0, 
= 0, 
= 27
B. 
= 0, 
= 0, 
= 3
C. 
= 0, 
= 0, 
= 
D. 
= 0, 
= 0, 
= 
Mathematics
Graph.x = -y2 - 2y - 5
A. 
B. 
C. 
D. 
Mathematics
Find the domain of the function.f(x) = 
A. (-?, 
) ? (
, ?)
B. (-?, 23) ? (23, ?)
C. (-?, 23]
D. (-?, 
]
Mathematics
Solve the problem.To find the distance AB across a river, a distance BC of 1176 m is laid off on one side of the river. It is found that B = 105.0° and 
Find AB. Round to the nearest meter.
A. 352 meters B. 302 meters C. 299 meters D. 349 meters
Mathematics