Find the LCD. Do not combine fractions.
, 
A. x2 - 4
B. (x - 2)(x2 - 4)
C. (x - 2)3
D. x - 2
Answer: A
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Solve the problem.The hydrogen potential, pH, of a substance is defined by 
where the hydrogen ion concentration, [H+], is measured in moles per liter. Find the hydrogen ion concentration of a solution whose pH is 7.4.
A. 3.98 × 10-8 moles per liter B. 0.86923172 moles per liter C. 2.51 × 107 moles per liter D. -0.8692317 moles per liter
Choose the most reasonable unit of measure.Area of a television screen: 1316 
(mm2, cm2, m2, km2)
A. mm2 B. cm2 C. km2 D. m2
Solve the problem.Christina made a chart summarizing her shop's financial performance over the past three years. 
How much money was lost in the months described as "Poor"?
A. $400 B. $1200 C. $10,800 D. $3600
Determine if the equation is an identity.cot2 
+ 1 = sec2 x
A. Yes B. No