If R is the set of real numbers, Q is the set of rational numbers, I is the set of integers, N is the set of natural numbers, and S is the set of irrational numbers, list the set(s) to which the given number belongs. If the number does not belong to any, state none.3
A. Q
B. S, R
C. I, Q, R
D. Q, R
Answer: D
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Simplify the rational expression. Use factoring, and assume all variable expressions represent positive real numbers.
A. 
B. 
C. 
D. 
Convert to an exponential equation.log10 15 = 1.1761
A. 1015 = 1.1761 B. 101.1761 = 15 C. 151.1761 = 10 D. 1.176110 = 15
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the hydrogen ion concentration if the 
A. 3.98 × 10-10 B. 2.51 × 10-10 C. 3.98 × 10-9 D. 2.51 × 10-9
Follow the principles of estimation to find an approximate value.Round the percent to the nearest one and dollars to the nearest ten thousand.Find 4.2% of $43,665.24.
A. $1833.94 B. $1600.00 C. $160,000.00 D. $16,000,000.00