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. 160 pretzels
B. 600 pretzels
C. 300 pretzels
D. 1.2 pretzels
Answer: C
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Solve the problem.If $2000 is invested at 10% annual interest, how much should be invested at 12% annual interest so that the total yearly income from both investments is $5000?
A. $4000 B. $4760 C. $40,000 D. $47,600
Change the Cartesian integral to an equivalent polar integral, and then evaluate.
A. 
B. 
C. 
D. 
Provide an appropriate response.Construct step 2 for the fractal below. 
A. 
B. 
C. 
D. 
Solve using a system of two equations in two unknowns.The manager of a bulk foods establishment sells a trail mix for $7 per pound and premium cashews for $15 per pound. The manager wishes to make a 120-pound 
mixture that will sell for $9 per pound. How many pounds of each should be used?
A. 60 lb of trail mix, 60 lb of cashews B. 75 lb of trail mix, 45 lb of cashews C. 90 lb of trail mix, 30 lb of cashews D. 30 lb of trail mix, 90 lb of cashews