Solve the problem.A fossilized leaf contains 18% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14.
A. 23,309
B. 13,829
C. 35,538
D. 1,600
Answer: B
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Solve.8y - 6 = 57 + y
A. 
B. 
C. 7
D. 9
The pH of a solution is given by the formula 
, where 
is the concentration of hydrogen ions in moles per liter in the solution. Use this formula to solve the problem.The pH value of a substance is 5.42. Find the hydrogen-ion concentration for this substance.
A. 263,026.8 B. 1.7 C. 0.2 D. 0.0000038
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. What are Mr. Cameron's expected concert earning?
A. $300,000 B. $360,000 C. $60,000 D. $218,400
Estimate the solution of the equation from the associated graph.Estimate the solution of y1 = y2.
A. 2 B. 8 C. -3 D. 1