Whats the answer to 19=4r+3

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.

The graph shows the distance kerri drives on a trip. what is kerri's speed . a. 25 b.75 c.60 d.50

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite