F(n) = 1.25n + 6.25 ; 25 the explicit rule for a sequence and one of the specific terms is given find the postion of the given term

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

Find the nonpermissible replacement for binthis expression.b2/5b +5

Complete the equation of the live through (-1,6) (7,-2)