PLZ HELP

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%.

The step function g(x) is defined as shown. what is the range of g(x)? ***answer choices in picture.

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is