Ms. Owens has some butterflies, 7 of them fly away. Now she has 12 butterflies left. How many butterflies did she start with?

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.