Solve.An express and local train leave GraysLake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train.
A. Express's rate = 60 mph and local's rate = 30 mph.
B. Express's rate = 50 mph and local's rate = 25 mph.
C. Express's rate = 25 mph and local's rate = 12.5 mph.
D. Cannot be determined with information given.
Answer: B
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Solve.A cold piston measures 8.665 cm in diameter. What heated, it expands an additional 0.024 cm. What is the diameter of the heated piston?
Fill in the blank(s) with the appropriate word(s).
Solve the problem.A company's profit amounted to 20% of its sales. If the profits were $2 million, then what was the total of the company's sales?
A. $12 million B. $8 million C. $10 million D. $11 million
Solve using Gauss-Jordan elimination. 6x + 4y = 0 4x + 2y = -2
A. (3, -2) B. (-2, -3) C. (-2, 3) D. No solution
Find all indicated roots. Write your answer in the specified form.Sixth roots of i; trigonometric form
A. cis 
, cis 
, cis 
, cis 
, cis 
, 1
B. cis 
, cis 
, cis 
, cis 
, cis 
, 
C. cis 
, cis 
, cis 
, cis 
D. cis 
, cis 
, cis 
, cis 
, i