Please help me with this and

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

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