300x5 y4 divided by xy2 find the quotient

What is the approximate circumference of the circle shown below?

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.