I just want a explanation on how you divide this. I don't want no answers I just need an explanation

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

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?