Write the number in scientific notation.In 1997, the total value of imports and exports for Taiwan was $53,010,000,000.
A. $53.01 × 109
B. $5.301 × 1011
C. $5.301 × 1010
D. $5.301 × 109
Answer: C
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Solve the problem.Suppose that R ={(x, y): 0 ? x ? 2, 0 ? y ? 5},R1 = {(x, y): 0 ? x ? 2, 0 ? y ? 4}, andR2 = {(x, y): 0 ? x ? 2, 4 ? y ? 5}. Suppose, in addition, that
dA = 5, 
dA = 5, and 
dA = 2.Use the properties of integrals to evaluate 
dA.
A. 16 B. 70 C. 30 D. 11
Solve the problem.Without using a calculator, find the geometric mean of 10 and 90.
A. 900 B. 100 C. 30 D. 50 E. 80
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
, where
is the concentration of hydrogen ions in moles per liter. What value of
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?
A. 
B. 
C. 
D. 
E. 