Solve the problem.Two recording devices are set 2,800 feet apart, with the device at point A to the west of the device at point B. At a point on a line between the devices, 400 feet from point B, a small amount of explosive is detonated. The recording devices record the time the sound reaches each one. How far directly north of site B should a second explosion be done so that the measured time difference recorded by the devices is the same as that for the first detonation?
A. 430.77 feet
B. 1142.61 feet
C. 1486.61 feet
D. 5562.37 feet
Answer: A
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Use l'Hopital's Rule to evaluate the limit.
A. -1
B. 1
C. 0
D. 
Find the square root. If it is not a real number, say so.
A. 
B. 
C. - 
D. 15
Solve the problem.A rumor is spread at an elementary school with 1200 students according to the model 
where N is the number of students who have heard the rumor and d is the number of days that have elapsed since the rumor began. How many students will have heard the rumor after 5 days?
Fill in the blank(s) with the appropriate word(s).
Solve the problem.The profit for the sale of tennis rackets in a sporting goods store is given approximately by 
where P(t) is profit in thousands of dollars for a week of sales t weeks after January 1. What is the rate of change of profit six weeks after the first of the year? (Express the answer to the nearest dollar.)
A. $734 per week B. $199 per week C. $1793 per week D. $8560 per week