Solve the problem.If a polygon, of n sides has 
n(n - 3) diagonals, how many sides will a polygon with 189 diagonals have?
A. 20 sides
B. 23 sides
C. 21 sides
D. 22 sides
Answer: C
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Use the indicated property to provide a new expression equal to the given expression. 8x + 4; commutative law for multiplication
A. 4x + 8 B. x(8) + 4 C. 4 + 8x D. 4 + x(8)
A hypothetical management science problem requires us to find the cheapest "supercircuit" in a graph. Three algorithms are available: Algorithm 1, Algorithm 2, and Algorithm 3.Algorithm 3 never produces a supercircuit that is off by more than 10% from the cheapest supercircuit. The amount of time that it takes to carry out Algorithm 3 is: 1 second for a graph with 5 or less vertices, 30 seconds for a graph with 6 vertices, 
for a graph with 7 vertices, and so on, increasing by 10 seconds every time we add a vertex (from 7 vertices on). Algorithm 3 is
A. an optimal and efficient algorithm. B. an approximate and inefficient algorithm. C. an optimal and inefficient algorithm. D. an approximate and efficient algorithm. E. none of these
Perform the indicated operation. Simplify if possible.
+ 
A. 
B. 
C. 
D. 
Use a table to solve the system of equations. If you use a calculator table, record the TbIStart and TbI entered.
y – 2.8x = 3.8 0.6x + y = 0.4 A) (–1, 2) B) (0, 1) C) (–1, 0) D) (–1, 1) E) (0, 2)