Please Help and show work!

The triangles are similar. what is the value of x? show your work.

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 of the symbols correctly relates the two numbers below check all that apply 6? 6