What is the midpoint of the segment shown below?

Quadrilateral wxyz is on a coordinate plane. segment yz is on the line x+y=7 and segment xw is on the line x+y=3. which statement proves how segments yz and xw are related

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9