If A denotes the area of the sector of a circle of radius r formed by the central angle ?, find the missing quantity. If necessary, round the answer to two decimal places.r = 11 inches, ? = 4 radians, A = ?
A. 44 in2
B. 22 in2
C. 242 in2
D. 484 in2
Answer: C
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Find the arc length parameter along the curve from the point where t = 0 by evaluating 
r(t) = (etcos t)i + (etsin t)j + 5etk
A. 
et - 3
B. 
et - 
C. 3
et - 
D. 3
et - 3
Perform the indicated operations. Simplify the answer.
A. -3 B. 3 C. 3i D. -3i
Provide an appropriate response.It can be shown that an ellipse with foci (c, 0) and (-c, 0), where the sum of the distances from any point 
of the ellipse to the two foci is 2a, has the equation 
+ 
= 1. Use this result to find an equation of an ellipse with foci (3, 0) and (-3, 0), where the sum of the distances from any point of the ellipse to the two foci is 8.
A. 
+ 
= 1
B. 
+ 
= 1
C. x2 + y2 = 64
D. 
+ 
= 1
Divide. Write the answer as a mixed number as needed.
÷ 
A. 1
B. 
C. 
D. 2