What is the length of the midsegment of this trapezoid?

Which function has the same domain as y=2x

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%.

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x