Solve.Two radio transmitters are located 250 miles apart on a shore and send simultaneous signals to a ship that is 125 miles offshore. The signal from transmitter T arrives at the ship 400 microseconds after the signal from transmitter S. The signals travel at the speed of 0.186 miles per microsecond. Find the equation of the hyperbola with foci S and T on which the ship is located. Let the center point between the transmitters correspond to the point (0, 0) and let the x-axis be oriented such that it contains the two transmitters. (Hint: For any point along the hyperbola, the absolute value of the difference of its distances from the foci is 2a.)
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Answer: D
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Solve the problem.The population P of elephants in a wild animal preserve changes with time (in years) according to the equation dP - 0.0004P(190 - P)dt = 0. Find P as a function of t if there are 36 elephants initially.
A. P = 
B. P = 
C. P = 
D. P = 
Use the quadratic function to determine if the function has a maximum or minimum value and then find this maximum or minimum value.f(x) = x2 - 18x + 87
A. minimum at (9, 6) B. minimum at (0, 9) C. maximum at (6, 9) D. maximum at (6, 0)
Solve the problem.A cross-country skier reaches the 10-km mark of a race 40 min after reaching the 
mark. Find the speed (average rate of change) of the skier.
A. 7 km/hr
B. 
km/hr
C. 
km/hr
D. 15 km/hr
Simplify the expression.36-3/2
A. 216
B. - 
C. -216
D. 