Solve using a system of three linear equations.A deli sells three sizes of turkey sandwiches: the small turkey sandwich contains 6 ounces of meat and sells for $2.50; the regular turkey sandwich contains 9 ounces of meat and sells for $3.00; and the large turkey sandwich contains 14 ounces of meat and sells for $3.50. A customer requests a selection of each size for a reception. She and the manager agree on a combination of 48 sandwiches made from 27 pounds 0 ounces of turkey for a total cost of $140. How many of each size sandwich will be in this combination? (Note: 1 pound = 16 ounces)
A. 22 small sandwiches, 10 medium sandwiches, 16 large sandwiches.
B. 18 small sandwiches, 22 medium sandwiches, 8 large sandwiches.
C. 16 small sandwiches, 12 medium sandwiches, 20 large sandwiches.
D. 20 small sandwiches, 16 medium sandwiches, 12 large sandwiches.
Answer: D
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Use Gauss-Jordan elimination to find the solution. Write the solution as an ordered triple. 6x + 7y - z = 76 x + 7y - 3z = 19-7x + y + z = -53
A. (-9, 6, 4) B. (9, 4, 6) C. (9, 6, 4) D. (-9, 4, 18)
Find the curvature of the space curve.r(t) = (t + 3)i + 3j + (ln(sec t) + 1)k
A. ? = sin t B. ? = csc t C. ? = cos t D. ? = sec t
The table shows the fraction of the world's surface land area taken up by each continent. Use the table to answer the question. Write your answer in simplest form. Continent Fraction of World's Surface Land Area North America 
South America 
Europe 
Africa 
Asia 
style="vertical-align: -17.0px;" /> Australia 
Antarctica 
How much greater is the fractional part of the continent of Africa than the fractional part of the continent of South America?
A. 
B. 
C. 
D. 
Find the vertices and locate the foci for the hyperbola whose equation is given.y = ± 
A. vertices: (0, -
), (0, 
)
foci: (0, -2
), (0, 2
)
B. vertices: (-10, 0), (10, 0)
foci: (-2
, 0), (2
, 0)
C. vertices: (-10, 0), (10, 0)
foci: (-
, 0), (
, 0)
D. vertices: (-
, 0), (
, 0)
foci: (-2
, 0), (2
, 0)