Solve the problem.A rectangular board is 13 by 20 units. The foci of an ellipse are located to produce the largest area. A string is connected to the foci and pulled taut by a pencil in order to draw the ellipse. Find the length of the string.
A. 13 units
B. 40 units
C. 20 units
D. 26 units
Answer: C
You might also like to view...
Solve the problem.If three cards are drawn without replacement from a deck, find the probability that the third card is a face card, given that the first card was a queen and the second card was a 5.
A. 
B. 
C. 
D. 
The rule of the derivative of a function f is given. Find the location of all points of inflection of the function f.f'(x) = (x + 2)2(x + 1)
A. 2, 0 B. -1 C. 1.67 D. 2, -1
Solve the problem.In one city, 34% of all aluminum cans distributed will be recycled each year. A juice company distributes 248,000 cans. The number still in use after time t, in years, is given by 
Find N'(t).
A. N'(t) = 248,000(0.34)t B. N'(t) = 248,000(ln 0.34)(0.34)t C. N'(t) = 248,000t(0.34)t-1 D. N'(t) = 248,000(ln t)(0.34)t
Use the graph to determine the function's domain and range.
A. domain: (-?, ?)
range: y = 1
B. domain: x = 
range: y = 1
C. domain: (-?, ?)
range: (-?, ?)
D. domain: x = 
range: (-?, ?)