Urban sprawl occurs when . a. cities spread out into the existing countryside b. cities extend upward c. people leave cities to live in rural areas d. none of the above Please select the best answer from the choices provided A B C D

Dominic and stacy each have a stamp collection. dominic has six fewer stamps than three times the number of stamps stacy has. dominic and stacy decide to give all of their stamps to their younger sister, mary. if stacy had s stamps, which expression represents the number of stamps that mary received? a. (3s − 18)(3s − 6) b. 2s − 18 c. 4s − 6 d. 4s − 18