Solve.
= 
A. -10
B. 0
C. 10
D. empty set
Answer: C
Mathematics
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Solve the problem.The hydrogen ion concentration of a substance is about 6.1 × 10-12 moles per liter. Find the pH. Round to the nearest tenth. Use the formula pH = -log [H+].
A. 11.2 B. 12.8 C. 11.6 D. -12.8
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Find the exact value of the expression.
A. -2
B. - 
C. -
D. - 
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Round the figure to the nearest dollar.$462.07
A. $463 B. $462 C. $461 D. $462.10
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If possible, find the slope of the line passing through the two points.(-1, -7), (1, 9)
A. - 
B. - 
C. 
D. 8
Mathematics