pH levels Use the following information. Chemists use the pH (hydrogen potential) of a solution to measure its acidity or basicity. The pH is given by the formula pH = -lg
where 
is the concentration of hydrogen ions in moles per liter. What value of is associated with pH level 11?
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Mathematics
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Using Green's Theorem, compute the counterclockwise circulation of F around the closed curve C.F = (x2 + y2)i + (x - y)j; C is the rectangle with vertices at (0, 0), (2, 0), (2, 3), and 
A. 24 B. -12 C. 12 D. 0
Mathematics
Which elements of the set are the indicated type?
; real numbers
A. 7, 
, -20, 0, ?, 
B. 7, 
, -20, 0, ?, 
, 
C. 7, -20, 0, 
D. 7, 
, -20, 0, 
Mathematics
Multiply. Leave the answer in factored form.
? 
A. 
B. 
C. 
D. 
Mathematics
Find the least common denominator.
+ 
A. m(m + 4)(m + 2) B. (m + 4)2 C. m(m + 4)2 D. m(m + 6)(m + 2)
Mathematics