Discover Questions

Show that the equation cos(x) − 3x = 1 has only one real root.? I'm having trouble balancing this equation:
CaO + SO2 + O2 -> CaSO4? Caesium is more metallic than Lithium justify? If one theoretically entered a black hole, stayed there for an hour and came back out, would time have changed more than an hour in earth? Find the equation of the line tangent to the graph of f(x) =x^4+2x^2 at the point where f (x)=1?