Hopefully someone can guide me step by step!

janet wants to make some new clothes. she purchases three pieces of fabric to make a dress, a jacket and a pair of pants. the first piece is 3 5/7 yd long. another piece is 4 2/7 yd long. and the last piece is 2yd long. find the total number of yards of fabric that janet purchases

Actually this is easier than you think:
3 5/7 yd + 4 2/7 yd + 2yd =
Add the whole numbers
3 + 4 + 2 = 9
Adding the fractions 5/7 + 2/7 = 1 yard
So the total yards is 10

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