Solve.Two radio transmitters are located 400 miles apart on a shore and send simultaneous signals to a ship that is 200 miles offshore. The signal from transmitter T arrives at the ship 300 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: A
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In order to answer the given question, which of the following types of study would be the most appropriate: an experiment without blinding, an experiment with single blinding, an experiment with double blinding, an observational study, or a case-control study?In which of these four soil types will the plants grow fastest?
A. Observational study B. Experiment without blinding C. Case-control study D. Experiment with single blinding E. Experiment with double blinding
A child has an enormous jar in which she has been saving all of her spare change. In order to determine exactly how much money she has in the jar, she dumps all of the coins on the floor and counts them. Under the watchful eye of her mother, she counts 180 pennies, 120 nickels, 100 dimes, and 80 quarters.If the child were to grab a handful of 48 coins at random from the jar, how much money should she expect it to be worth?
A. $39.60 B. $4.80 C. $3.78 D. $4.92 E. none of these
Solve. Remember to insert units when writing your answer.In November, 10 tons 1037 lb of coal were delivered to a steel mill. In December, 6 tons 1715 lb were delivered. Find the total amount of coal delivered in these two months.
A. 16 tons 752 lb B. 17 tons 752 lb C. 3 tons 1322 lb D. 4 tons 1322 lb
Translate the phrase into a mathematical expression and then find the result.968 students per 22 classrooms
A. 968 ÷ 22; 45 r5 students per classroom B. 968 ? 22; 14 students per classroom C. 968 ? 22; 45 students per classroom D. 968 ÷ 22; 44 students per classroom