Solve the problem.A barge takes 3 hours to move (at a constant rate) downstream for 21 miles, helped by a current of 2 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.
A. 42 hours
B. 7 hours
C. 3 hours
D. 5 hours
Answer: B
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Solve the inequality.
< 0
A. x < 3, p > 6
B. 3 < x < 5, x > 6
C. 3 < x < 6
D. 3 < x < 5, 5
Identify the domain and range of the relation.Ranking of finalists in ice-skating competition: 
A. Domain: {1, 2, 3, 4}; Range: {Alice, Toni, Marcie, Celia} B. Domain: {Alice, Toni, Marcie, Celia} ; Range: {1, 2, 3, 4} C. Domain: {1, Alice}; Range: {2, Toni} D. Domain: {1, 2, 3, 4, 5......}; Range: {Alice, Toni, Marcie, Celia}
Find the vertices and the foci of the given ellipse.25x2 + 81y2 = 2025
A. V: (-81, 0), (81, 0);
F: (-9, 0), (9, 0)
B. V: (0, -9), (0, 9)
F: (0, - 2
), (0, 2
)
C. V: (0, -25), (0, 25)
F: (0, -5), (0, 5)
D. V: (-9, 0), (9, 0);
F: (- 2
, 0), (2
, 0)
Change the decimal into a proper fraction or mixed number. Simplify if necessary. 0.188
A. 
B. 
C. 
D. 