Which expressions are equivalent to the on below select all that apply 9x

Solve for x i'll try to attach the files bc it's not letting me for some reason

The inside wheels of a car traveling on a circular path are rotating half as fast as the outside wheels. the front two wheels are six feet apart. what is the number of feet in the path traced by the inside front wheel in one trip around the circle? express your answer in the form "k \pi", where k is an integer.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?