Solve the system analytically.x + 5y + 4z = -2 4y + 5z = -1 z = -1
A. {(-3, 1, -1)}
B. ?
C. {(-1, 1, -3)}
D. {(-3, -1, 1)}
Answer: A
Mathematics
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A. 
B. 
3
C. 3
ln 3
D. 
3
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A. 
B. 
C. 
D. 
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A steel girder weighing 200 lb is hoisted from ground level to the roof of a 40-ft building using a chain that weighs 5 lb/running foot. Find the work done.
a. 4,000 ft-lb b. 8,100 ft-lb c. 12,000 ft-lb d. 8,000 ft-lb
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Find the exact value. If the value of the function is not defined, write undefined.sin 
A. 0
B. -1
C. Undefined
D. 
Mathematics