Which line has a constant proportionality between y and x of 2/3

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 expression is rational? 6. , square root two, square root 14, square root 49

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct