SOMEONE PLS HELP I REALLY NEED HELP WITH THESE ALG 2 TRIG QUESTION I NEED THE ANSWERS WITHIN 2 HOURS

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Which function has the smallest y-intercept value

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