Plz help me out with this 1-4

Can someone check my answer? you : )

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

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.