The equation D = 
n(n - 3) gives the number of diagonals D for a polygon with n sides. Use this equation to solve the problem.Find the number of diagonals for a polygon that has 13 sides.
A. 130 diagonals
B. 10 diagonals
C. 65 diagonals
D. 104 diagonals
Answer: C
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Solve.A population is growing at a rate proportional to its size. If the population is 126,000 initially and 183,000 after 12 years, what will the population be after 21 years?
A. 232,425 B. 251,794 C. 242,109 D. 2138
Find the term that should be added to the expression to form a perfect square trinomial. Write the resulting perfect square trinomial in factored form.x2 - 18x
A. 81; (x - 9)2 B. 81; (x + 9)2 C. 81; (x - 18)2 D. 0; (x - 9)2
Use Cramer's rule to solve the system.0.3x + 0.08y = 122x - y = -100
A. ? B. {(300, 400)} C. {(400, 300)} D. {(3, 4)}
Solve the problem.Given the area of the figure, factor to find possible expressions for the length and the width. 
A. (10y + 3)(y + 10) B. (2y - 3)(5y - 2) C. (2y + 3)(5y + 2) D. (10y + 3)(y + 2)