What is the standard form of this equation of a circle?
(x+2)^2 + (y-7)^2=81

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%.

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?