Solve the problem.Find the pH of a solution with a hydrogen ion concentration of 10-4.3 moles per liter.
A. -4.3
B. 9.9
C. 5.7
D. 4.3
Answer: D
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Solve. Write results using scientific notation.Assume that the volume of the earth is 4.2 x 1014 cubic meters and the volume of a bacterium is 3.4 x 10-16 cubic meters. If the earth could be filled with bacteria, how many would it contain?
A. 1.24 x 1030 bacteria B. 1.24 x 10-30 bacteria C. 1.24 x 1031 bacteria D. 1.24 x 10-31 bacteria
Solve.Alan's yard is rectangular and measures 9.7 meters by 11.1 meters. Maria's yard is rectangular and measures 39.9 meters by 32.3 meters. What is the total area of the two yards?
A. 1181.10 m2 B. 1396.44 m2 C. 1984.50 m2 D. 11,811.0 m2
Solve the problem.In 1990, the population of a country was estimated at 4 million. For any subsequent year the population, P(t) (in millions), can be modeled by the equation 
where t is the number of years since 1990. Estimate the year when the population will be 21 million.
A. approximately the year 2093 B. approximately the year 2041 C. approximately the year 2088 D. approximately the year 2016
Perform the conversion. Round to the nearest hundredth when necessary.5 km to mi
A. 3.11 mi B. 8.05 mi C. 4.73 mi D. 5.3 mi