Question

A group of students must collect at least $150 to organize a science fair. They have already collected $30. Which graph best represents all remaining amounts of money, in dollars, that the students should still collect to organize the science fair?
Number line graph with closed circle on 120 and shading to the right.
Number line graph with closed circle on 30 and shading to the right.
Number line graph with closed circle on 150 and shading to the right.
Number line graph with closed circle on 180 and shading to the right.

Answer 1

Number line graph with closed circle on 120 and shading to the right.

Since they need $150 in total and they already have $30 that means they need $120 or more to complete their $150. That means x = the amount of money they still need has to be greater than or equal to $120. The equation should be x >/= $120. Since a close circle means greater than or equal to and it matches that equation it means it that one. Also the circle has to be on 120 because it that the starting point of the amount they still need. And since they can get 120 or more it points to the right side.