Solve the problem.A surveyor is measuring the distance across a small lake. He has set up his transit on one side of the lake 120 feet from a piling that is directly across from a pier on the other side of the lake. From his transit, the angle between the piling and the pier is 40°. What is the distance between the piling and the pier to the nearest foot?
A. 143 ft
B. 77 ft
C. 101 ft
D. 92 ft
Answer: C
Mathematics
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Write an iterated integral for 
S = {(x, y, z): 0 ? x ? 7, 0 ? y ? 5, 0 < z ? (6 - 4x - 4y)}
A. 
B. 
C. 
D. 
Mathematics
Determine the standard equation of the ellipse described.Foci at (0, 4) and (-4, 4); vertex at (-5, 4).
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Solve the system by elimination.-7x + 9y = 42-4x + 6y = 24
A. {(-7, 1)} B. {(-6, 0)} C. {(x, y)|-4x + 6y = 24} D. ?
Mathematics
Solve using the elimination method. Use a graphing calculator to check your answer.
x - 
y = -18
x + 
y = -9
A. (12, 0) B. (0, 12) C. (-12, 0) D. (0, -12)
Mathematics