Solve the problem.A certain radioactive isotope decays at a rate of 0.1% annually. Determine the half-life of this isotope, to the nearest year.
A. 500 yr
B. 693 yr
C. 301 yr
D. 7 yr
Answer: B
Mathematics
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A solution has a hydroxyl ion concentration of 8.33 × 10-14. Find the hydrogen ion concentration in this solution.
A. 1.2 × 10 [H+] B. 0.012 mol/L [H+] C. 1.2 × 10-1 mol/L [H+] D. 1.2 mol/L [H+]
Mathematics
Solve the problem. Round to the nearest hundredth, if necessary.Assume that the mean length of a human pregnancy is 268 days with a standard deviation of 9 days. What percentage of human pregnancies do we expect to last no more than 279 days?
A. 58.71% B. 88.88% C. 88.49% D. 89.07%
Mathematics
Decide whether the figure is convex or concave.
A. Concave B. Convex
Mathematics
Find the graph that matches the given system of equations.3x + 4y = 14
A. 
B. 
C. 
D. 
Mathematics