Explain why the sum of the angle measures in any triangle 180 degrees

What are the relative frequencies, to the nearest hundredth, of the rows of the two-way table? group 1: a 15 b 45 group 2: a 20 b 25

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have