Solve.The equation D = 
n(n - 3) gives the number of diagonals D for a polygon with n sides.Find the number of sides n for a polygon that has 20 diagonals.
A. 3 sides
B. 9 sides
C. 5 sides
D. 8 sides
Answer: D
Mathematics
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A. 10 B. 4 C. -2 D. 5
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Simplify the following by combining like terms.4x8 + 8x7 - 6x8
A. 6x23 B. -2x8 + 8x7 C. 6x7 D. cannot be simplified
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Find the exact value of the following expression without using a calculator.cos
A. 
B. - 
C. - 
D. - 
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Find the sum and simplify the answer. 
A. 
B. 
C. 
D. 
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