Solve the problem.Add (2x + 12 + 6x3) to the sum of (4 + x2 + 3x) and 
A. 7x3 - 2x2 + 5x + 4
B. 8x3 + 2x + 4
C. 7x3 + x2 + 2x + 4
D. 7x3 + x2 + 2x + 16
Answer: C
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Solve the problem.An express train and a local train both leave Gray's Lake 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: 25 mph; local: 12.5 mph B. Express: 60 mph; local: 30 mph C. Express: 50 mph; local: 25 mph D. Cannot be determined without more information
Solve the problem using the vector form v = 
[(cos ?)i + (sin ?)j].A weight of 500 lb is supported by a frame made of two rods and hinged at points A, B, and C. Find the forces exerted by the two rods rounded to the nearest pound. 
A. Horizontal rod: 10-lb tension; other rod: 555 -lb compression B. Horizontal rod: 673 -lb tension; other rod: 450-lb compression C. Horizontal rod: 450-lb tension; other rod: 673-lb compression D. Horizontal rod: 555-lb tension; other rod: 747-lb compression
Determine whether the point is a solution to the given inequality.y ? -3x; (6, -18)
A. (6, -18) is not a solution B. (6, -18) is a solution
Solve the equation and express the solution in exact form using either ln or log as indicated.3x = 81
Express the answer using ln.
A. {ln 27}
B. 
C. {ln 12}
D. 