Solve the problem.Water is steadily pumped out of a flooded basement. Let v be the volume of water (in thousands of gallons) that remains in the basement t hours after water begins to be pumped. A linear model is shown. After how many hours of pumping will all the water be pumped out of the basement?
A. 4 hours
B. 5.5 hours
C. 4.5 hours
D. 5 hours
Answer: D
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Express the number in scientific notation.0.0000004
A. 4 × 10-6 B. 4 × 10-8 C. 4 × 10-7 D. 4 × 10-9
The table shows the fraction of the world's surface land area taken up by each continent. Use the table to answer the question. Write your answer in simplest form. Continent Fraction of World's Surface Land Area North America 
South America 
Europe 
Africa 
Asia 
style="vertical-align: -17.0px;" /> Australia 
Antarctica 
How much greater is the fractional part of the continent of Asia than the fractional part of the continent of North America?
A. 
B. 
C. 
D. 
Simplify.(x-4y4)-1
A. 
B. 
C. 
D. 
Solve the problem.The production function f(x, y) for an industrial country was estimated as 
where x is the amount of labor and y the amount of capital. Find the marginal productivity of labor.
A. 8x7y3 B. 14x6y4 C. 4x7y3 D. 7x6y4