Simplify the expression. Assume that all variables are positive.
-1/2
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Find the center of mass of a thin plate covering the given region with the given density function.The region between the x-axis and the curve y = 
, 1 ? x ? 2, with density ?(x) = 
A. 
= 
, 
= 1
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Mathematics
Find the area of the shaded region.
y = -x4
A. 
B. 2
C. 
D. 
Mathematics
Solve the problem.From the top of a vertical tower, 355 feet above the the surface of the earth, the angle of depression to a doghouse is 
How far is it from the doghouse to the foot of the tower? Round your answer to the hundredths place when necessary.
A. 681.46 ft B. 784.06 ft C. 693.86 ft D. 665.87 ft
Mathematics
Find the exact value of the trigonometric expression without the use of a calculator.cos (265° - 25°)
A. - 
B. - 
C. 
D. - 
Mathematics