Subtract.(23x + 9xy - 5y) - (20x - 28xy - 27y)
A. 62xy
B. 3x + 37xy + 22y
C. 3x - 37xy - 32y
D. 14x - 3xy + 32
Answer: B
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Evaluate the line integral along the curve C.
ds, C is the curve r(t) = (9 sin 
t)i + (9 cos 
t)j + 12tk, 2 ? t ? 4
A. 
B. 
C. 
D. - 
Solve the problem.Sales of snow shovels are seasonal. Suppose the sale of snow shovels in Maine is approximated by 
where t is time in months and t = 0 is October. What are the sales in December?
A. 15,000 B. 13,900 C. 18,660 D. 17,071
Determine the value of the trigonometric function of ? using the given information.If csc ? = 
and sec ? = 
, then determine the value of tan ?.
A. 
B. 
C. 
D. 
In the diagram, S represents the position of a power relay station located on a straight coast, and E shows the location of a marine biology experimental station on an island. A cable is to be laid connecting the relay station with the experimental station.
?
?
If the cost of running the cable on land is $2.40/running foot and the cost of running the cable under water is $3.00/running foot, locate the point P that will result in a minimum cost (solve for x).
?
?x? = __________ ft
Fill in the blank(s) with the appropriate word(s).