Solve.In chemistry, the pH of a substance is defined by 
where 
is the hydrogen ion concentration in moles per liter. Find the 
of a sample of lake water whose hydrogen ion concentration, 
, is 
moles per liter. (Round to the
nearest tenth.)
A. 6.4
B. 7.3
C. 10.1
D. 8.5
Answer: D
Mathematics
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Find the Cartesian coordinates of the given point.(
, ?/6)
A. 
B. 
C. 
D. 
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Use the following figure to answer question
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The graphs of two functions f(x) and g(x) are given.Solve f(x) ? g(x).
A. x ? -3 or x ? 3 B. x ? -2 or x ? 2 C. -2 ? x ? 2 D. -3 ? x ? 3
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Write the described ratio in fractional notation in lowest terms.According to an organization's membership list, it has 2200 members who are 50 or older and 
who are younger than 50. What is the ratio of members who are younger than 50 to the total number of members?
A. 
B. 
C. 
D. 
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