Solve the problem.Suppose f(x) = 29.0 + 33log (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 38.
A. -0.5
B. 2.9
C. 0.3
D. 0.9
Answer: D
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Indicate whether the graph of the equation is a circle, an ellipse, a hyperbola, or a parabola. Then graph the conic section.x = 7 + (y + 5)2
A. hyperbola
B. parabola
C. ellipse
D. circle
Perform the requested composition or operation.Find (g ? f)(-5) when f(x) = -3x + 9 and g(x) = -6x2 + 6x - 4.
A. 561 B. -4 C. -3316 D. 21
Use the reference angle to find the exact value of the expression. Do not use a calculator.sin 855°
A. 
B. - 
C. 
D. - 
Solve.The amount of gas that a helicopter uses varies directly as the number of hours spent flying. The helicopter flies for 4 hours and uses 52 gallons of fuel. Find the number of gallons of fuel that the helicopter uses to fly for 5 hours.
A. 70 gallons B. 65 gallons C. 20 gallons D. 78 gallons