Discover Questions

I'm told the radiation is too strong for man to venture above lo Earth orbit (leo) .. is this true? Many people have said this.? Surface by rotating the arc y^2=9x from x=0 to 4 through 2π around x axis is 49π.Show that
x̄ of this surface is: 3/49*integral{x(4x+9)dx}? Find an equation for the plane that contains the line v = (−1, 1, 2) + t(8, 2, 6) and is perpendicular to the plane 5x + 2y − 3z + 3 = 0.? How do I find the tangent plane to surface?
I need to find the tangent plane at (3,4,-3) for the equation:
x^2+y^2-z^2-4xy+4xz=-68? What volume of 0.222 M sulfuric acid contains 11.6 grams of sulfuric acid (H2SO4)? Include steps, please.?