Can anyone help fast?

1. a right triangle is graphed on a coordinate plane. find the length of the hypotenuse. round your answer to the nearest tenth. 2. use the angle relationship in the figure below to solve for the value of x. assume that lines a and b are parallel and line c is a transversal.

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

Which equation matches the graph shown ?