please help me understand so i may help my daughter with her hw

Find the vertex. the focus. and the direotrix. Draw the graph of )(2 +6x+6y+21 =0. The focus is . (rype an ordered pair.) What is the direetrtx? Select the correct choice below and ll In the answer box to complete your choice. 0 A. The direotrix is y = O B. The directrix is x = Use the graphing tool to graph the equation. An engineer designs a satellite dish with a parabolic cross section. The dish is 14 ft wide at the opening, and the focus is placed 3 ft from die veiex. a} Position a coordinate system with the origin at the vertex and the xaxis on me parabola's axis of symmetry and find an equation of the parabola. b} Find the depth of the satellite dish at the vertex. a) The equation for the parabola is h} The depth of the dish at the vertex is (The gure may not be drawn to scale.) . (Type an equation. Simplify your answer.) ft. (Simplify your answer.)