Abus makes a stop at 2: 30 it's letting off 15 people and letting on 9 the bus makes another stop 10 minutes later to let off 4 more people how does the number of people on the bus after the second stop compare the number of people on the bus before the 2: 30 it stop

Initially, it lets off 15 people but picks up 9, for a total change of losing 6 people.  If it lets off 4 more people, it has then lost 10 people total.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle