Find the first partial derivatives of the function.
?
?
A. 
?
B. ?
?
C. ?
?
D. ?
?
Answer: B
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If 
, use the calculator to get the value of 
at
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Divide. Simplify if possible.
÷ 
A. 
B. 
C. 
D. 
Solve.How long will it take for the population of a certain country to triple if its annual growth rate is 2%? Round to the nearest year.
A. 2 yr B. 151 yr C. 55 yr D. 24 yr
Solve the problem.In a chemistry class, 7 liters of a 4%-saline solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
A. 3.5 L B. 7.0 L C. 2.5 L D. 4.5 L