Region R is revolved about the x-axis to form a solid of revolution whose cross sections are washers. What is the outer radius of a cross section of the solid at a point x in [0, 4]

This is about circle theorems. someone asap : (

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955