12x-20=n(3x-5) what does n equal

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%.

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

True or false? a circle could be circumscribed about the quadrilateral below.