Which undefined geometric term can be described as a one-dimensional set of points that has no beginning or end?

Evaluate the expression for the given value of the variable. | ? 4 b ? 8 | + ? ? ? 1 ? b 2 ? ? + 2 b 3 -4b-8+-1-b2+2b3 ; b = ? 2 b=-2

Which of the following shows the length of the third side, in inches, of the triangle below

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?