Two trains leave the same station headed in opposite directions. After 4 hours the trains are 120 miles apart. If train A travels twice as fast as train B, how fast does train A travel?

Ineed with number 17 i don’t get it at alll

50 points! antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.