Graph the solution set of the system of inequalities or indicate that the system has no solution.
A. 
B. 
C. 
D. 
Answer: D
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Find the cross-product and determine whether the proportion is true or false.
= 
A. 8 ? 162; false B. 72 = 72; true C. 18 ? 72; false D. 36 = 36; true
Simplify.
A. 
B. 
C. 
D. 
Solve the problem.List all the combinations of 4 objects 1, 2, 3, and 4 taken 3 at a time. What is C(4, 3)?
A. 111, 112, 113, 114, 121, 122, 123, 124, 131, 132, 133, 134, 141, 142, 143, 144, 211, 212, 213, 214, 221, 222, 223, 224, 231, 232, 233, 234, 241, 242, 243, 244, 311, 312, 313, 314, 321, 322, 323, 324, 331, 332, 333, 334, 341, 342, 343, 344, 411, 412, 413, 414, 421, 422, 423, 424, 431, 432, 433, 434, 441, 442, 443, 444 C(4, 3) = 64 B. 123, 124, 134, 234 C(4, 3) = 4 C. 123, 124, 134, 234, 321, 432 C(4, 3) = 6 D. 123, 124, 132, 134, 142, 143, 213, 214, 231, 234, 241, 243, 312, 314, 321, 324, 341, 342, 412, 413, 421, 423, 431, 432 C(4, 3) = 24
Solve the problem.The area A(r) = ?r2 of a circular oil spill changes with the radius. At what rate does the area change with respect to the radius when 
A. 20 ft2/ft B. 20? ft2/ft C. 100? ft2/ft D. 10? ft2/ft