Some classrooms have 35 chairs while others have only 30. The total number of chairs in 10 classrooms is 330. How many classrooms have 35 chairs?

Find the value of the cosine for angle a

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

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?