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In elementary algebra, the quadratic formula is the solution of the quadratic equation.

$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

Water is made from two elements - Hydrogen and Oxygen. If you put the two gases together, along with energy, you can make water.

$2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\rightleftharpoons 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

The entire formula for the surface area of a cylinder is $2{\mathrm{\pi r}}^2+2\mathrm{\pi rh}$