What is a responsible estimate of -3 4/5+(-5.25)and the actual value?

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.

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10

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