Simplify the expression. Assume that all variables represent non-negative real numbers.-13
- 15
A. -28
B. 28
C. -28
D. 28
Answer: A
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Make an approximate conversion as indicated. Round to the nearest tenth. The precise value of your approximation will depend on the conversion path that you choose.23 km = 
mi
A. 24.4 B. 14.3 C. 21.8 D. 37.0
Find the derivative of y.y = ln (sinh 10x)
A. coth 10x
B. 
C. 10 coth 10x
D. 10 csch 10x
Find an equation for the surface consisting of all points P for which the distance from P to the x-axis is times the distance from P to the yz-plane.
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Solve the problem.The loudness of a sound can be approximated by the formula d = 10 log10
, where d is the number of decibels. The higher the value of d, the louder the sound. Find the number of decibels when 
and 
A. 10,000 decibels B. 4 decibels C. 14 decibels D. 40 decibels