Use the pH scale to answer the question.What is the pH of a solution with a hydrogen ion concentration of 10-12 mole per liter? Is this solution an acid or a base?
A. pH = 12; base
B. pH = 6; acid
C. pH = 7; neutral
D. pH = 13; base
Answer: A
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Solve the problem.Suppose that the amount of oil pumped from a well decreases at the continuous rate of 
per year. When, to the nearest year, will the well's output fall to one-eighth of its present value?
A. 21 years B. 2 years C. 9 years D. 14 years
Express the sum or difference as a product.sin 8x - sin 2x
A. 2 cos 2x cos 5x B. 2 sin 3x C. 2 sin 5x cos 3x D. 2 sin 3x cos 5x
Is the following correspondence a function?DomainRange 
A. function B. not a function
Evaluate the appropriate geometry formula to answer the question.A plot of land is being developed for commercial use. The land is surrounded by two sets of parallel roads, forming the parallelogram shown below. What is the area of the land?
A. 546.8 yd2 B. 7996.64 yd2 C. 4897.2 yd2 D. 9794.4 yd2