Solve.An express train travels 462 miles between two cities. During the first 
of a trip, the train traveled through mountainous terrain. The train traveled 
per hour slower through mountainous terrain than through level terrain. If the total time to travel between the cities was 9 hours, find the speed of the train on level terrain.
A. 38 mph
B. 78 mph
C. 58 mph
D. 18 mph
Answer: C
Mathematics
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Factor the expression completely.
m
- 
m
(conservation of energy)
A. 
(mvi + mvf) (vi - vf)
B. Cannot be factored.
C. 
m(vi + vf) (vi - vf)
D. 
(mvi + vf) (vi - mvf)
Mathematics
Use the distributive property to multiply. Then, if possible, simplify the resulting expression.3(7 + m)
A. 21m B. 21 + m C. 21 + 7m D. 21 + 3m
Mathematics
Solve the equation by multiplying both sides by the LCD.
= 1 + 
A. {14} B. {-42, 14} C. {12, -14} D. {-12, 14}
Mathematics
Use a calculator to approximate to three decimal places.
A. 1.166 B. 1 C. 1.194 D. 1.179
Mathematics