Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
and 
A. Yes
B. No
Answer: B
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Using the Divergence Theorem, find the outward flux of F across the boundary of the region D.F = (y-x)i + (z-y)j + (z-x)k ; D: the region cut from the solid cylinder x2 + y2 ? 49 by the planes z = 0 and 
A. 98? B. 0 C. -98? D. -98
Find the mode or modes.Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mode(s).56?60?6457?53?6668?5854
A. 58 B. 56, 60, 64, 57, 53, 66, 68, 58, 54 C. 59.6 D. No mode
Use Gauss-Jordan elimination to solve the linear system and determine whether the system has a unique solution, no solution, or infinitely many solutions. If the system has infinitely many solutions, describe the solution as an ordered triple involving variable z.5x + 2y + z =-112x - 3y - z=177x - y=12
A. no solution B. (-2, 0, -1) C. (1, -5, 0) D. (0, -6, 1)
Find the ratio. Simplify, if possible.A machine can fill 1064 boxes of cereal in 0.2 hour. How many boxes of cereal can it fill per hour?
A. 1064 boxes/hour B. 213 boxes/hour C. 5320 boxes/hour D. 3547 boxes/hour