... an input value for the function f, except for x= 6, as this substitution would result in a division by 0. Since x= 6 is not a valid input for f, we say that f is not defined for x= 6. ... can always be solved by the formula: xbb aca=- -242. For example, in the quadratic equation 2602xx =, a = 2 , b=-1, and c=-6. Therefore, the formula yields x = ()-()-()-()()==114262214941742 ... interior angles of an n-sided polygon is ()().n -2 180 For example, the sum for a triangle ()n = 3 is ()() ,3 2 180 180-= and the sum for a hexagon ()n = 6 is ()() .6 2 180 720-= A polygon...