Solve the rational inequality and graph the solution set on a real number line. Express the solution set in interval notation.
< 0
A. (-?, -9) or (3, ?)
B. (3, ?)
C. (-?, -9)
D. (-9, 3)
Answer: D
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Solve the problem.A stone is thrown into a pond. A circular ripple is spreading over the pond in such a way that the radius is increasing at the rate of 2.1 feet per second. Find a function, r(t), for the radius in terms of t. Find a function, A(r), for the area of the ripple in terms of r. 
A. (A ? r)(t) = 4.41?t2 B. (A ? r)(t) = 4.2?t2 C. (A ? r)(t) = 2.1?t2 D. (A ? r)(t) = 4.41?2t
Solve the problem.It took three assembly-line workers 4.21 seconds, 5.882 seconds, and 4.5 seconds to assemble a product. How many seconds in all did they work?
A. 14.592 sec B. 8.71 sec C. 10.092 sec D. 6.172 sec
Add.
?
?
A. -47.11 B. -47.01 C. -47.31 D. -45.61 E. -47.1
Find the area of the shaded region. Round to the nearest hundredth if necessary.
A. 
B. 2
C. 4
D. 
E. 3