Solve.The function A = A0e-0.00693x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 400 pounds of the material are initially put into the vault, how many pounds will be left after 150 years?
A. 133 lb
B. 300 lb
C. 252 lb
D. 141 lb
Answer: D
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Solve.A stock worth $157 per share on July 12 dropped to $69 per share on July 31 of the same year. Find how much it lost in value from July 12th to the 31st.
A. $88 B. $98 C. $92 D. $89
Find the value of df-1/dx at x = f(a).f(x) = x2 - 4x + 9; a = 4
A. 
B. 
C. 4
D. 
Starting in the year 2000, the number of crimes committed each year in Middletown is predicted to grow according to a linear growth model. During the year 2000, Middletown recorded 2 crimes (P0 = 2). During the year 2001, Middletown recorded 6 crimes (P1 = 6).According to the model, in what year will 62 crimes be recorded in Middletown?
A. 2015 B. 2061 C. 2014 D. 2062 E. none of these
Solve the problem.Fred is in a row boat that is 4 miles from the shore of a lake. He wants to get to his house, which is 15 miles down the shore, as shown below. He will row to shore and then jog the remaining distance along the shore. He can row at 3 miles per hour and can jog at 6 miles per hour. At about what point along the shore should he beach the boat and jog the rest of the way if he wants to get home as soon as possible? Round your answer to the nearest tenth of a mile, if necessary.4 miles
? 15 miles
A. 10.8 mi from home B. 12.7 mi from home C. 14.2 mi from home D. 9 mi from home