Solve.If the population of a certain country doubles in 15.40 years, find the growth rate k. Assume that the population increases exponentially.

A. 3.1%
B. 5.7%
C. 8.2%
D. 4.5%

Answer: D

Mathematics

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The graph of an ellipse is given. Find the standard form of the equation of the ellipse. 

A. x2 +  = 1
B.  + y2 = 1
C.  + y2 = 1
D.  - y2 = 1

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Mathematics

Solve the equation. = 

A.
B.  
C.  
D. 1

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Mathematics

Solve the problem.The profit that the vendor makes per day by selling x pretzels is given by the function  Find the number of pretzels that must be sold to maximize profit.

A. 700 pretzels B. 0.7 pretzels C. 45 pretzels D. 350 pretzels

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Mathematics

Express the statement as an equation involving the indicated variables.The surface area S of a sphere is 4 times ? times the square of the radius r.

A. S = 4? 
B. S = 4?r2
C. S = ?r2
D. S = 4?r

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Mathematics