(a+b)(a-b)=
What is the answer​

Which of the following statements is not true? a. parallel lines are lines in the same plane that never intersect. b. congruent figures have the same shape and same size angles and sides. c. similar figures must have the same shape and the same size. d. a rotation is when you turn a figure around a certain point.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

True or false? a circle could be circumscribed about the quadrilateral below.