Find the area of the region.
160 ft
A. 400 sq ft
B. 6390 sq ft
C. 6410 sq ft
D. 6400 sq ft
Answer: D
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Solve the problem.The shape and density of a thin shell are indicated below. Find the coordinates of the center of mass.Shell: cone x2 + y2 - z2 = 0 between z = 1 and z = 4Density: constant
A. 
B. 
C. 
D. 
Solve and graph.|x + 1| ? 0
A. {x
x < -1}, or (-?, -1)
B. {-1}
C. ?
D. {1}
Solve the problem.An experiment in a wind tunnel generates cyclic waves. The following data is collected for 60 seconds: 
Let V represent the wind speed (velocity) in feet per second and let t represent the time in seconds. Write a sine equation that describes the wave.
A. V = 42 sin (60t - 30) + 21
B. V = 58 sin(60t - 30) + 16
C. V = 21 sin 
+ 37
D. V = 58 sin 
+ 16
Calculate how many times more intense an earthquake with a Richter number of 8.1 is than an earthquake with a Richter number of 6.9. Please round the answer to the whole number.
A. 21 B. 24 C. 16 D. 26 E. 18