?Which of the following polyhedra is not a regular polyhedron?
A. ?Tetrahedron
B. ?Octahedron
C. ?Icosahedron
D. ?Cube
E. ?Diahedron
Answer: E
Mathematics
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Graph the solution set of the system.2x + y ? 4 x - 1 ? 0
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 30 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 12 liters B. 15 liters C. 7.5 liters D. 10.0 liters
Mathematics
Match the polar equation with its graph.r = 
A. 
B. 
C. 
D. 
Mathematics
Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
and 
A. Yes B. No
Mathematics