Perform the indicated operations. Be sure to simplify your answer.
+ 
A. 
B. 
C. 
D. 
Answer: B
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Where R is the radius of the larger circle and r is the radius of the smaller circle, the area of the ring (or annulus) is given by A = 
.
Answer the following statement true (T) or false (F)
Find the product and simplify. Assume all variables represent nonnegative real numbers.(5
+ 7 )(
- 4)
A. 5x + 27
- 28
B. 5x + 13
- 28
C. 5x - 13
+ 28
D. 5x - 13
- 28
Solve the problem.A student is told to answer any 7 out of 10 questions on an exam. In how many different ways can he choose the 7 questions to answer?
A. 720 B. 10,000,000 C. 120 D. 21
Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the y-axis.y = 
, y = 0, x = 7, x = 9
A. 30? B. 10? C. 20? D. 15?