Janet is three years older than her sister julie. janets brother is 8 years younger than her sister julie .the sum of all of their ages is 55 years

(40 points) i need some . an answer definition is appreciated as well.

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.)

Write as a product: ac^2–ad+c^3–cd–bc^2+bd