Factor x3-2x2-9x+18 completely if(x+3) is a factor

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%.

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

Simplify the algebraic expression 8y-2(y+4)