Solve the problem.The perimeter of a rectangle is 54 m. If the width were doubled and the length were increased by 9 m, the perimeter would be 90 m. What are the length and width of the rectangle?
A. Length: 13 m; width: 8 m
B. Length: 13 m; width: 13 m
C. Length: 9 m; width: 18 m
D. Length: 18 m; width: 9 m
Answer: D
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A. ?, for all x B. 1 C. 0 D. 2
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Solve the problem involving related quantities.The three most prominent buildings in a city, Washington Center, Lincoln Galleria, and Jefferson Square Tower, have a total height of 1800 feet. Find the height of each building if Jefferson Square Tower is three times as tall as Lincoln Galleria and Washington Center is 200 feet taller than Lincoln Galleria.
A. Washington Center: 690 ft Lincoln Galleria: 230 ft Jefferson Square Tower: 880 ft B. Washington Center: 520 ft Lincoln Galleria: 320 ft Jefferson Square Tower: 960 ft C. Washington Center: 600 ft Lincoln Galleria: 200 ft Jefferson Square Tower: 1000 ft D. Washington Center: 400 ft Lincoln Galleria: 200 ft Jefferson Square Tower: 1200 ft
Solve the problem.An experienced accountant can prepare a tax return in 12 hours. A novice accountant can do the job in 22 hours. How long will it take them to do the job working together?
A. 7
hr
B. 
hr
C. 
hr
D. 26
hr