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 
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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Solve the problem.Let 
be the cost to manufacture x items. Find the average cost per item to produce 30 items.
A. $1330 B. $227 C. $87 D. $244
Mathematics
Use a calculator to evaluate the expression. Round your answer to the nearest thousandth.
A. -0.109 B. -0.063 C. -0.071 D. -0.058
Mathematics
Solve.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 72 seconds are required to make a 3-by-4 enlargement, find the time required for a 4-by-8 enlargement.
A. 160 sec B. 256 sec C. 224 sec D. 192 sec
Mathematics
Perform the indicated operation. Write the answer in simplest form. If the answer is an improper fraction, write it as a mixed number.1
÷ 
A. 
B. 5
C. 5
D. 5
Mathematics