Draw a diagram to represent the number.
A. 
B. 
C. 
D. 
Answer: A
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Solve the problem.How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the function A(t) = 700e-0.181t, where t is the time in years? Round your answer to the nearest hundredth year.
A. 36.19 years B. 40.02 years C. 126.70 years D. 3.83 years
Use the limit comparison test to determine if the series converges or diverges.
A. Diverges B. Converges
Solve the problem.In a study of heat transfer in a grid of wires, the temperature at an exterior node is maintained at a constant value (in °F) as shown in the figure. When the grid is in thermal equilibrium, the temperature at an interior node is the average of the temperatures at the four adjacent nodes. For instance 
Find the temperatures T1, T2, and T3 when the grid is in thermal equilibrium. 
108°180°
A. T1 = 
, T2 = 
, T3 = 105
B. T1 = 
, T2 = 
, T3 = 
C. T1 = 
, T2 = 
, T3 = 
D. T1 = 
, T2 = 
, T3 = 
Find the proportion of observations of a standard normal distribution that are between the given z-scores.0.11 and 2.11
A. 0.4383 B. 0.9388 C. 0.4423 D. 0.4388