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) = 750e-0.144t, where t is the time in years? Round to the nearest hundredth year.
A. 50.79 yr
B. 4.81 yr
C. 108.00 yr
D. 45.97 yr
Answer: B
Mathematics
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Find the unknown number in the proportion. Round answer to the nearest hundredth when necessary.
= 
A. x = 120.45 B. x = 0.04 C. x = 5.19 D. x = 23.32
Mathematics
Find the sample standard deviation from the set of measurements below.1.65, 2.35, 4.17, 7.11, 3.63, 2.82, 4.11, 8.27, 4.72, 3.67, 6.14, 1.86, 6.38, 4.17, 2.88, 1.03, 9.61, 7.71
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Mathematics
Choose the proper 
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Mathematics
Find the missing angle in the triangle.Two angles are 50° and 10°.
A. 300° B. 120° C. 60° D. 30°
Mathematics