Perform the indicated operation.
+ 
A. 
B. 
C. - 
D. 
Answer: D
Mathematics
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Solve the problem.The disk (x - 4)2 + y2 ? 9 is revolved about the y-axis to generate a torus. Find its volume. (Hint: 
= 
?, since it is the area of a semicircle of radius 3.)
A. 36? B. 72?2 C. 18?2 D. 36?2
Mathematics
Perform the indicated operation and, if possible, simplify. Assume that all variables represent positive real numbers. 
A. 3x
B. 3x
C. 3x
D. x
Mathematics
Factor the perfect square trinomial completely.25x2 - 40xy + 16y2
A. (5x - 4y)(5x + 4y) B. (5x + 4y)2 C. (5x - 4y)2 D. (25x + y)(x + 16y)
Mathematics
Solve.A doctor wants a patient to receive 2.1 L of a normal saline solution in a 
period. How many milliliters per hour must be administered?
A. 0.175 mL B. 2100 mL C. 175 mL D. 25.2 mL
Mathematics