What is the y intercept of -3x-9

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

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%.

What is the solution set of the quadratic inequality x^2-5< or equal to 0