Thanks you guys, these too. God I feel so stupid. These are the last ones. I kinda understand the first one, but the second one involves a circle and parabola. :? 
C. The cross section of a television antenna dish is a parabola. For one dish, the receiver is located at the focus, 4 ft above the vertex. Find an equation, for cross section of the dish (vertex at the origin). If the dish is 8 ft wide how deep is it?
E. A spacecraft is in circular orbit (clockwise) 150 km above Earth. Once it obtains the velocity needed to escape Earth's gravity, the spacecraft will follow a parabolic path with focus at the center of the Earth. Supose it obtains its escape velocity above the North Pole. Assume center is at origin and the radius of the Earth is 6400 km. Write an equation for the parabolic pathe of the spacecraft.
Oh and Merry Belated Christmas (do people say that?) and a very happy new year!
C. The cross section of a television antenna dish is a parabola. For one dish, the receiver is located at the focus, 4 ft above the vertex. Find an equation, for cross section of the dish (vertex at the origin). If the dish is 8 ft wide how deep is it?
E. A spacecraft is in circular orbit (clockwise) 150 km above Earth. Once it obtains the velocity needed to escape Earth's gravity, the spacecraft will follow a parabolic path with focus at the center of the Earth. Supose it obtains its escape velocity above the North Pole. Assume center is at origin and the radius of the Earth is 6400 km. Write an equation for the parabolic pathe of the spacecraft.
Oh and Merry Belated Christmas (do people say that?) and a very happy new year!
