Please help!
Will mark brainliest if it allows me to, Solve of inequalities

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 equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)

If sin(x) = 0 and cos(x) = 1, what is tan(x)?