How can i find a unit rate when given a rate?

Name the most appropriate metric unit for each measurement like the mass of cow

When turned about its axis of rotation, which shape could have created this three-dimensional object?

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)