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 = 100e-0.077x, 6.7 mg
B. y = 100e-0.077x, 4.6 mg
C. y = 86e-0.071x, 5.0 mg
D. y = 92e-0.0686x, 5.9 mg
Answer: B
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Solve the problem. Assume all numbers are approximate unless otherwise stated or the number has been determined by a definition or counting process.The current (in amperes, A) running through a resistor in an electric circuit can be calculated by dividing the voltage measured across the resistor (in volts) by the resistance of the resistor (in ohms). If the voltage measured across a resistor is 
and the resistance is 210 ohms, how much current runs through the resistor?
A. 1.1 A B. 25 A C. 0.88 A D. 69,000 A
Add. Write your answer in lowest terms.
A. 1
B. 
C. 
D. 1
Factor.x2 + 10x + 9
A. (x - 1)(x + 9) B. (x + 1)(x - 9) C. (x - 1)(x - 9) D. (x + 1)(x + 9)
Write a numerical expression for the phrase and simplify it.9 less than the difference between 17 and -8
A. 8 - 17 - 9; -34 B. [17 - (-8)] - 9; 16 C. 9 - 17 - (-8); 0 D. -8 - 17 - 9; -34