Just answer quickly 3x - 7y + 5x -1 + 4y

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%.

Can someone, me with this. i really need with this

A10 inch cookie cake is divided into 8 slices. what is the area of 3 slices