3,900 prescriptions out of 4,500

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Find the slope of a line given the following two points

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15