Solve the problem.A nuclear scientist has a sample of 
of a radioactive material which has a half-life in hours. She monitors the amount of radioactive material over a period of a day and obtains the following data. Use a graphing utility to fit an exponential function to the data. Predict the amount of material remaining at 40 hours.
.
A. y = 92e-0.0686x, 5.9 mg
B. y = 100e-0.077x, 4.6 mg
C. y = 100e-0.077x, 6.7 mg
D. y = 86e-0.071x, 5.0 mg
Answer: B
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Use the following definitions to determine if the statement is true or false. N = {x : x is a natural number}I = {x : x is an integer}R = {x : x is a real number}W = {x : x is a whole number}Q = {x : x is a rational number}I is a proper subset of N, W, Q, and R.
A. True B. False
List all the elements of B that belong to the given set.B = {8, 
, -23, 0, 
, - 
, 8.7}Integers
A. {8, 0, 
}
B. {8, 0}
C. {8, -23}
D. {8, -23, 0}
Solve the problem. Round your answer to three decimals.How long will it take for an investment to double in value if it earns 4.5% compounded continuously?
A. 24.414 years B. 7.702 years C. 15.403 years D. 16.653 years
Multiply or divide as indicated.
÷ 
A. 
B. 
C. y - 10
D. 