Solve the problem.You have 84 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side along the river, find the length and width of the plot that will maximize the area.
A. length: 42 feet, width: 21 feet
B. length: 63 feet, width: 21 feet
C. length: 21 feet, width: 21 feet
D. length: 42 feet, width: 42 feet
Answer: A
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Solve the problem.The data below represent the average monthly cost of natural gas in an Oregon home. 
Above is the graph of 45.05 sin x superimposed over a scatter diagram of the data. Find the sinusoidal function of the form 
which best fits the data.
A. y = 45.05 sin 
+ 66.25
B. y = 45.05 sin 
+ 21.20
C. y = 45.05 sin 
+ 21.20
D. y = 45.05 sin 
+ 66.25
Solve the equation by completing the square.x2 - 10x + 61 = 0
A. 5 + 6i B. 5 - 6i, 5 + 6i C. -1, 11 D. 5 - 36i, 5 + 36i
Graph the circle with radius r and center (h, k).r = 3; (h, k) = (4, 0) 
A. 
B. 
C. 
D. 
Use the properties of limits to help decide whether the limit exists. If the limit exists, find its value.
A. 8 B. 16 C. 1 D. Does not exist