What happens with my warnings, does it matter how many i get?

Pick the description of a geometric object that best matches the real world object box for a deck of card

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

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?