Subtract.4.6 - 8.6
A. 13.2
B. -13.2
C. 4
D. -4
Answer: D
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Solve the problem.The pH of a chemical solution is given by the formula pH = -log10[H+] where [H+] is the concentration of hydrogen ions in moles per liter. Find the pH if the [H+] = 9.4 × 10-9.
A. 8.97 B. 9.03 C. 8.03 D. 9.97
Provide an appropriate response.Finish the statement with a correct response. To divide two fractions one needs to:
A. Use the reciprocal of the second fraction (divisor), add the numerators and multiply the denominators. B. Use the reciprocal of the second fraction (divisor) and multiply. C. Add the numerators and multiply the denominators. D. Add the numerators and factor the denominators.
Find the length of the third side of the right triangle. Assume that c represents the length of the hypotenuse. Give an exact answer and, if appropriate, an approximation to three decimal places.a = 7, b = 24
A. c = 31 B. c = 625 C. c = 25 D. c = 27
Solve.The average price (in dollars) to rent a studio in a certain city can be approximated by the equation 
where t is the number of years since 1990. Solve this equation for t and use the new equation to determine approximately what year it will be when the average price of a studio in this city reaches $1316.60.
A. 2016 B. 2015 C. 2017 D. 2014