It is given that a polygon with n sides has n/2(n-3) diagonals. (a)How many sides does a polygon with 90 diagonals have?
(b)Is there a polygon with 100 diagonals?Justify your answer .

30 ! the graph shows the number of siblings different students have. select from the drop-down menus to correctly complete the statement.

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15

If two lines form congruent alternate interior angles with a transversal, then the lines