Solve the problem.The hydrogen ion concentration of a substance is about 4.2 × 10-6 moles per liter. Find the pH. Round to the nearest tenth. Use the formula pH = -log [H+].
A. 6.6
B. -6.6
C. 5.7
D. 5.4
Answer: D
Mathematics
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Find the union.{e, f, g, h, i} ? {h, i, j, k, l}
A. ? B. {e, f, g, j, k, l} C. {h, i} D. {e, f, g, h, i, j, k, l}
Mathematics
Provide an appropriate response.Simplify by combining like terms: 7a + 6 - 4b + 7b - 2 + a
Fill in the blank(s) with the appropriate word(s).
Mathematics
Simplify the rational expressions.
A. 
B. - 
C. 
D. 
Mathematics
Solve.A rock falls from a tower that is 400 ft high. As it is falling, its height is given by the function 
How many seconds will it take for the rock to hit the ground (h=0)?
A. 20 sec B. 5 sec C. 25 sec D. 10,000 sec
Mathematics