Find the locus of a point which moves such that it is equidistant from i) (2,0) and (-1, 4)
ii) (3,5) and (6,0)
iii) (-2, 7) and (5, 6)
iv) (a, b) and (b, a)

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school. each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220