Solve the problem.Suppose f(x) = 30.8 + 1.4log (x + 1) models salinity of ocean water to depths of 
at a certain latitude. x is the depth in meters and f(x) is in grams of salt per kilogram of seawater. Approximate the depth (to the nearest tenth of a meter) where the salinity equals 31.
A. -0.3
B. 0.4
C. 2.4
D. -0.9
Answer: B
Mathematics
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Solve the problem.Given that the current in a given circuit is 
and the impedance is 3.73 + 16.06j k?, find the voltage.
A. 3.8664 + 16.032j V B. 0.057 - 2.086j V C. 0.057 + 2.295j V D. 0.96 + 2.086j V
Mathematics
Solve the problem.Find the center of mass of a tetrahedron of density 
bounded by the coordinate planes and the plane 
.
A. 
= 
, 
= 
, 
= 
B. 
= 
, 
= 
, 
= 
C. 
= 
, 
= 
, 
= 
D. 
= 
, 
= 
, 
= 
Mathematics
Solve the problem.On a flywheel with a 67.7-mm radius, how long is an arc subtended by a central angle of 242°?
A. 9,679 mm B. 572 mm C. 286 mm D. 102,940 mm
Mathematics
Simplify the expression. Write the result using positive exponents only.(-5x5y-6)(3x-1y)
A. 
B. -15x4y7
C. 
D. 
Mathematics