How many ways can 8 players be chosen from 10 players

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

The appalachian trail is a hiking trail that passes through the appalachian mountains. three members of a teen hiking group hiked a section of the trail. the hikers stopped at a rest area and equally shared 3 4 gallon of water. how much water did each person get?

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180