Solve the problem.Suppose f(x) = 34.6 + 1.5 log (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 salinity (to the nearest hundredth) when the depth is 224 meters.
A. -31.07
B. 82.89
C. 38.13
D. 79.89
Answer: C
Mathematics
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+ 
A. 
B. 
C. 
D. 
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Solve using the quadratic formula.4x2 - 28x + 40 = 0
A. 2, -5 B. 2, 5 C. -2, 5 D. -2, -5
Mathematics
Solve the problem.What is the intensity in watt/m2 of a noise that's loudness is measured at 98 decibels?
A. 9.8 × 10-10 watt/m2 B. 6.31 × 10-3 watt/m2 C. 6.31 × 10-2 watt/m2 D. 1.8 × 1016 watt/m2
Mathematics
Use a double-angle identity to find the exact value of the expression.1 - 2 sin2 
A. - 
B. 
C. - 
D. 
Mathematics