Find the ratio a: b, if it is given that

5a−3b=7b

What two criteria are needed for triangles to be similar

If the probability of an event happening is 65% then the probability this event does not occur?

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