1. is -7+9=-9+7 true, false , or open? a) true b) false c) open 2. is 4x-3=19 true, false , or open ? a) true b) false c) open 3. which of the following is a solution to the equation 16=4x-4 ? a) -5 b) -4 c) 5 d) 16 4. an art student wants to make a rectangular classroom. the length of the classroom is 2.4 times it’s width. the length of the students model is 42 in. what should the width of the model be? a) 17.5in b) 20.5in c) 83.6in d) 100.8in