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 × 10-4
B. 2.51 × 10-4
C. 2.51 × 10-5
D. 3.98 × 10-5
Answer: D
Mathematics
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Rewrite the following number using digits.Seven billion
A. 7,000,000 B. 7,000,000,000 C. 7,000,000,000,000 D. 14,000,000,000
Mathematics
Solve. Round to the nearest tenth.One end guy wire is attached to the top of a 12-foot pole and the other end is anchored into the ground 7 feet from the base of the pole. Find the length of the guy wire.
7 feet
A. 19 ft B. 13.9 ft C. 19.3 ft D. 13.6 ft
Mathematics
Provide an appropriate response.Simplify by combining like terms: -3x + 7x
A. 4x B. -10x C. -4x D. 21x
Mathematics
Use a calculator to find the function value to four decimal places.sin 61.1°
A. 0.4833 B. 0.9871 C. 0.8755 D. 1.8115
Mathematics