Choose the expression that best models the situation. Joe started hiking at an altitude of 30 feet below sea level. He ended his hike at 40 feet above sea level. What was his change of elevation?

In the final round of trivia competition, contestants were asked to name as many states that begin with the letter m as they could in 15 seconds. the bar graph shows the number of states the contestants were able to name. how many contestants participated in the final round of the competition? a) 6 b) 8 c) 14 d) 20

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30