The outdoors club members are planning some activities to do on a
sunny autumn saturday. one half of the members are going hiking. one
fourth of the members are bike riding. one eighth of the members are
rock climbing. nine of the members are walking their dogs. how many
outdoor club members are doing an activity on saturday? show all your
mathematical thinking.
show the work

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

How many groups are there?