Mr. duc asked perry to set up 450 chairs in a large hall. Perry puts 20 chairs in each Row. He has already set up 15 rows of chairs. How many more chairs must he set up

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?