Could I get some help? What are the values of a and b in each right triangle? Please explain too cause I am so confused-

Chamberlin wants to bottle 1\8 of her apple cider. she pours the apple cider evenly among 6 bottles. what fraction of her apple cider will she put in each bottle? what expression could represent this situation?

How can you construct perpendicular lines and prove theorems about perpendicular lines

Solve the triangle. a = 21°, c = 105°, c = 5