An is spoken or written summary of observations

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

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?