Which is the best unit of measure for determining the width of a house

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)