The set of all points equidistant from the endpoints of a segment what term matches the definition? a) central angle eliminate b) perpendicular bisector c) segment d) skew lines

How do you solve a question like this?

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

What are two numbers that have a sum of 15?