How do i figure out question 1 part b? ? i know the answer is 56(the answers are in the back of the textbook) but how do i show my working / figure it out ? by the way the answer to part a is

Rugby teams have 13 in the starting line up and 4 subs. That means there are (13 + 4) = 17 players on each team. And if there is 8 teams...
(8 * 17) = 136 total players

each team has 6 forwards and 1 sub forwardso that (6 + 1) = 7 total forwards per team. And if there is 8 teams(8 * 7) = 56 forwards

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