I need to check if it's correct. Can someone tell me how to explain the whole thing

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%.

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Is the ordered pair (-10, 7) a solution to the equation y = 17 – x? yes or no